In the following question, a sentence/part of the sentence is underlined. Below are given alternatives to the underlined sentence/part of the sentence (a), (b), (c) which may improve the sentence. Choose the correct alternative. In case no improvement is needed your answer is (d).
He may have grown taller than when I last saw him.
from when I last saw him
since I last saw him
before I last saw him
No improvement
B.
since I last saw him