The first person to successfully orbit the Earth was Yuri Gagarin, a Soviet cosmonaut. Gagarin’s voyage, which was completed in 1961, was a momentous achievement in space exploration.
","stem_html":"Which choice best combines the sentences at the underlined portion so that it conforms to the conventions of Standard English?
","rationale_html":"The correct answer is A. To combine the sentences, we can use a comma and a participial phrase to modify the noun "voyage." The participial phrase "completed in 1961" is a nonessential modifier, so it needs to be set off with commas. The other options are incorrect because they either create a comma splice or don't use commas correctly.
","correct_answer":["A"],"has_media":false,"has_mathml":false,"has_table":false,"source_created_at":null,"source_updated_at":null,"options":[{"label":"A","content_html":"Gagarin’s voyage, completed in 1961, was a momentous achievement
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","ord":1},{"label":"C","content_html":"Gagarin’s voyage was completed in 1961, was a momentous achievement
","ord":2},{"label":"D","content_html":"Gagarin’s voyage, which was completed in 1961, was a momentous achievement
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