Answer: A. however.
Step-by-step explanation: A Conjunctive adverb is a part of speech that helps connect one clause to another. Some examples of conjunctive adverbs are: in addition, therefore, in fact, nonetheless, however, etc. In the given sentences there are two independent clauses "My new drum set looks awesome" and "My old drum set feels more comfortable", those two clauses should be join by a conjunctive adverb, which in this case is "however".