Which one of the following sentences contains an abstract noun?

a. his smile could charm anyone.
b. the vase was quite expensive.
c. logic is easily understood.
d. she handed him the dishtowel.

cassius, casca, and their allies plant false documents to manipulate brutus to join their cause to remove caesar. after doing so, they visit brutus at night in his home to persuade him of their views. there they plan caesar's death. brutus is troubled but refuses to confide in his devoted wife, portia. on 15 march, caesar's wife, calpurnia, urges him not to go to the senate. she has had visionary dreams and fears the portents of the overnight storms.

im not entirely sure, but i think the answer is listing