Identify the correctly punctuated sentence. a. agent orange is believed to be the cause of some illnesses suffered by veterans was widely used in chemical warfare in vietnam. b. michael dorris's book the broken cord made readers more aware of the problem of fetal alcohol syndrome, one of his adopted sons was diagnosed with this condition. c. johnny cash auditioned for a record producer, singing mainly gospel tunes, was told to come back with new material. d. one day nick's roommate brought home a ferret; he'd seen it at a pet store and couldn't resist it.

D

Explanation:

D is the only correctly-punctuated sentence of them all. A is almost incomplete, as there are 2 ideas joined in a single sentence without even a comma to separate them (even though the ideal thing would be a period after "veterans." B is almost correct, but the comma that follows "syndrome" should either be replaced by a semi-colon or a period, or the next sentence should start with a lead-in like "as."  C is correct up until the second comma, where a new idea is introduced; this new idea should be introduced as a new sentence, with either a period or a semi-colon. D is the correct use of the semi-colon, as it separates a different idea from the first one, but not so much as to put a period between them.

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the answer is b