Which one of the following sentences contains an abstract noun?

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

Lauses unnecessary to the meanings of the words modified demonstrative 2. clauses necessary to the meanings of the words modified relative 3. words for which pronouns stand intensive 4. a pronoun ending in -self and referring to the previously used noun or pronoun nonrestrictive clauses 5. a pronoun ending in -self and used for emphasis restrictive clauses 6. pronouns that ask questions indefinite pronouns 7. pronouns that point out to whom or to what the speaker is referring reflexive 8. everyone, nobody, and something are examples antecedents 9. pronouns introducing adjective or noun clauses interrogative 10. i, you, him, mine, and their are examples personal pronouns

The tankers are so large how did some crew members get from one point to another while on board

Which adjective best describes the narrators father according to the narrator