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Option 3 : R
The error is in part R of the sentence. therefore, the correct answer is option 3.
The error lies in the wrong usage of the preposition 'at'. 'At' is generally used to denote a specific time and not 'within a space of time'. In that case, the preposition 'in' should be used.
For example:
I shall go on a trip to the mountains in December.
Therefore, the correct sentence is:
I shall be back from my grandma's place in a week's time.
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