In the following question, part of the sentence is underlined. Below are given alternatives to the underlined part, which may improve the sentence. Choose the correct alternative. In case no improvement is needed, choose the option ‘No Improvement’. As far as detective Beckett was concerned, the details of the case weren’t adding in. 

In the following question, part of the sentence is underlined. Below are given alternatives to the underlined part, which may improve the sentence. Choose the correct alternative. In case no improvement is needed, choose the option ‘No Improvement’. As far as detective Beckett was concerned, the details of the case weren’t adding in.  Correct Answer Adding up

The sentence uses the form ‘adding in’, which is incorrect and thus needs improvement.

Adding in is a phrasal verb which means to include something as a part of something else.

Adding up is a phrasal verb which means to gradually increase until there is a large or complete amount.

Thus, the alternative, ‘add up’ would be an improvement for the sentence and makes it meaningful.

Therefore the correct answer is option 2.