Which one of the folk sentences contains an abstract noun ?

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

the examples that saki used to represent satire through situational irony are options two (2) and five (5) inasmuch as the wolf thought that looking for a girl in the bushes could be as easy as hunting little pigs at the park, but it took him so much time to find the girl if it had not been not for a silly mistake. also, bertha would have survived to the wolf's hunt if she had not won those medals for goodness, which at the end they were what got her killed by making noise, so winning medals of goodness was not so good achievement, after all.

i also think it is d (sorry if it's not)