sayantanc2k wrote:
In that case let me try to explain from an entirely different perspective why option E is grammatically alright:
Here "it" is a placeholder. A placeholder "it" can be used to hold the position of an infinitive subject that is postponed to the end of the sentence. Here the subject is "to keep drinks and bottles out of dogs' reach at all times" - this subject is shifted to the end of the sentence and the placeholder "it" takes its position in the beginning
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