Find the synonym of the underlined word.
His mother’s alert mind caught Billy’s lies.

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alarming

vigilant

sluggish

answer is B.

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The word ‘alert’ is employed in the following way:
For example, within the sentence, ‘The alert policeman caught the thief’, it means the policeman was being careful and watchful.
In the given sentence, the word also refers to the identical thing. It means the mother was being watchful and hence, discovered that Billy was lying.
Now, we all know the meaning and context of the word. Let’s examine our options:
Option A: Alarming - The word ‘alarming’ refers to something that's ‘worrying or disturbing’. This features a completely different meaning to the given word. So, this is often an incorrect option.
Option B: Vigilant - This word refers to ‘keeping careful watch’. This has the identical meaning to the word ‘alert’. So, this is often the correct option.
Option C: Sluggish - This word refers to something that's ‘slow-moving or inactive’. This features a completely different meaning to the word ‘alert’. So, this is often an incorrect option.
Option D: Oblivious - This word refers to ‘not being conscious of or concerned about what is happening around one’. This has the other meaning to the given word.
Hence, option B is the correct answer.

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