Final answer:
The correct word to use in the sentence is 'deleterious'. This word represents the harmful effects of smoking and fits in the context of the sentence.
Step-by-step explanation:
In the given sentence, the appropriate word to use would be choice (D) 'deleterious'. This word means harmful or injurious and fits perfectly into the context of the sentence, which is discussing the negative effects of smoking. So the completed sentence is: 'The nurses participated in a campaign to keep high schoolers away from the deleterious habit of smoking.' The other choices - salubrious, beneficial, and salutary - all have positive connotations, which would not be applicable in this case.
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