The correct option is C familiar
Although the town had changed in the ten years since he had visited it, much of it was still 'familiar' to him.
Option C, 'familiar', is correct because time can alter the appearance of a town a bit but can't remove the old essence from it. The term 'familiar' means close, intimate, dear. So, in this case familiar is the most appropriate word to complete the sentence. 'Common' means ordinary, usual. So, it doesn't suit the context properly and the other options are irrelevant.