Using Capybara with Webkit to select an option from a Chosen Multiselector

I have a multiselector that uses the Chosen plugin as shown below:

<%= select_tag :provinces,
options_for_select(DataHelper::all_provinces_captions.zip(DataHelper::all_provinces_ids)),
{:multiple => true, class: 'chosen-select chzn-select', 
:data => {:placeholder => 'Filter Provinces/States'}, 
:style => "width: 100%; height: 100px;"}%>

Here are the relevant DataHelper selection arrays:

def self.all_provinces_captions
    usa_provinces_with_caption.map { |x| x.first } + canada_provinces_with_caption.map { |x| x.first }
end
def self.all_provinces_ids
    usa_provinces_with_caption.map { |x| (Province.find_by name: x.first).id} + canada_provinces_with_caption.map { |x| (Province.find_by name: x.first).id }
end
def self.usa_provinces_with_caption
        [["Alabama", "alabama"], ["Alaska", "alaska"], ["Arizona", "arizona"], ["Arkansas", "arkansas"], ["California", "california"], ["Colorado", "colorado"], ["Connecticut", "connecticut"], ["Delaware", "delaware"], ["District Of Columbia", "district of columbia"], ["Florida", "florida"], ["Georgia", "georgia"], ["Hawaii", "hawaii"], ["Idaho", "idaho"], ["Illinois", "illinois"], ["Indiana", "indiana"], ["Iowa", "iowa"], ["Kansas", "kansas"], ["Kentucky", "kentucky"], ["Louisiana", "louisiana"], ["Maine", "maine"], ["Maryland", "maryland"], ["Massachusetts", "massachusetts"], ["Michigan", "michigan"], ["Minnesota", "minnesota"], ["Mississippi", "mississippi"], ["Missouri", "missouri"], ["Montana", "montana"], ["Nebraska", "nebraska"], ["Nevada", "nevada"], ["New Hampshire", "new hampshire"], ["New Jersey", "new jersey"], ["New Mexico", "new mexico"], ["New York", "new york"], ["North Carolina", "north carolina"], ["North Dakota", "north dakota"], ["Ohio", "ohio"], ["Oklahoma", "oklahoma"], ["Oregon", "oregon"], ["Pennsylvania", "pennsylvania"], ["Rhode Island", "rhode island"], ["South Carolina", "south carolina"], ["South Dakota", "south dakota"], ["Tennessee", "tennessee"], ["Texas", "texas"], ["Utah", "utah"], ["Vermont", "vermont"], ["Virginia", "virginia"], ["Washington", "washington"], ["West Virginia", "west virginia"], ["Wisconsin", "wisconsin"], ["Wyoming", "wyoming"]]
end
def self.canada_provinces_with_caption
        [["Alberta", "alberta"], ["British Columbia", "british columbia"], ["Manitoba", "manitoba"], ["New Brunswick", "new brunswick"], ["Newfoundland", "newfoundland"], ["Northwest Territories", "northwest territories"], ["Nova Scotia", "nova scotia"], ["Nunavut", "nunavut"], ["Ontario", "ontario"], ["Prince Edward Island", "prince edward island"], ["Quebec", "quebec"], ["Saskatchewan", "saskatchewan"], ["Yukon", "yukon"]]
end

How do I select an option from this chosen selector in a Capybara integration test on the Ruby on Rails framework? I have tried the conventional selector method, and that hasn't work, as well as the Capybara method for filling out textboxes - and that hasn't worked for me either.