Just a friendly reminder to please please please include the source whenever you post a new question! This is really important.
As usual,abhimahna 's explanation is spot-on, and (D) is clearly the best of the bunch... but for whatever it's worth, the verb tenses really don't make much sense, even in the correct answer. The parents currentlywork full-time, but theyhad a nanny in the past? That's either a typo, or a poorly written, non-official question.
So please take this one with a grain
...
As usual,abhimahna 's explanation is spot-on, and (D) is clearly the best of the bunch... but for whatever it's worth, the verb tenses really don't make much sense, even in the correct answer. The parents currentlywork full-time, but theyhad a nanny in the past? That's either a typo, or a poorly written, non-official question.
So please take this one with a grain
...
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