Answer:
B. My grandfather has over 40 stamps in his passport. It seems like he's travelled everywhere.
This option does not contain a sentence fragment. Both sentences are complete and express a complete thought. A sentence fragment is a group of words that looks like a sentence, but isn't. It is a common type of error in written English. Sentence fragments are groups of words that have been punctuated like sentences but lack a subject, a verb, or both, or they do not express a complete thought. The other three options each contain at least one sentence fragment.