Answer:
B) Dana checked for them, but they're not home.
Explanation:
This sentence is spelled correctly and has the correct pronkuns. The other sentences have grammatical errors.
This would be a "fragment" "Went to the lake' lacks detail and it's short which would make it a sentence fragment because it's a portion of a sentence. So, We all went to the lake for a swim' would make it a sentence.
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B. The benefit lost when choosing between 2 options