By aligning with him, he was heading into a serious disaster. A. along B. towards C. for D. No improvement

The correct answer is (A).

The word “align” means to arrange or position something so that it is in a straight line with something else. In this sentence, the speaker is saying that the person they are talking about is making a mistake by associating with someone who is likely to cause them harm. The word “along” would not be a good choice because it does not convey the idea of danger or risk. The word “towards” could be used, but it would not be as strong as the word “along.” The word “for” is not a good choice because it does not make sense in the context of the sentence.

Here is a more detailed explanation of each option:

• (A) “Align” is the best choice because it conveys the
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  idea of danger or risk. The speaker is saying that the person they are talking about is making a mistake by associating with someone who is likely to cause them harm.
• (B) “Along” would not be a good choice because it does not convey the idea of danger or risk. The speaker is not saying that the person they are talking about is simply going in the same direction as someone who is likely to cause them harm. They are saying that the person is making a mistake by associating with that person.
• (C) “Towards” could be used, but it would not be as strong as the word “along.” The speaker is not simply saying that the person they are talking about is headed in the general direction of someone who is likely to cause them harm. They are saying that the person is making a mistake by associating with that person.
• (D) “For” is not a good choice because it does not make sense in the context of the sentence. The speaker is not saying that the person they are talking about is doing something for someone who is likely to cause them harm. They are saying that the person is making a mistake by associating with that person.