Options:
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Earlier discussion
4 older comments kept for context.
Oyekale Joseph
The correct answer is A, which is watch for. The under phrase in the question is look out which means to watch out for.
God's-Favour Akpata
The correct answer is d. Looking out for someone means to take care of someone
rex robinson
the correct answer is watch for [a]
Atere Dorcas
The correct answer is 'visit'
According to the sentence he meant 'when next he's in town he'd look out for her'
It is a different thing of they say 'when next I come I'll look out for you' that is when you can use 'watch out for '