回答編集履歴
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わかりやすいようにサンプルコードを追記
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`ActionView::Helpers::FormOptionsHelper#options_for_select`を使い、
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配列にクラスを持たせればできます。
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以下APIdockより抜粋
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> You can optionally provide HTML attributes as the last element of the array.
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> ```ruby
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options_for_select([ "Denmark", ["USA", {class: 'bold'}], "Sweden" ], ["USA", "Sweden"])
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# => <option value="Denmark">Denmark</option>
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# => <option value="USA" class="bold" selected="selected">USA</option>
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# => <option value="Sweden" selected="selected">Sweden</option>
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>
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options_for_select([["Dollar", "$", {class: "bold"}], ["Kroner", "DKK", {onclick: "alert('HI');"}]])
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# => <option value="$" class="bold">Dollar</option>
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# => <option value="DKK" onclick="alert('HI');">Kroner</option>
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> ```
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