Hi. Please have a look. Thank you.

Read the following passage and identify the type of sentence structure error it contains.

Mr Grink, who was walking along the boulevard dressed in an impeccable tuxedo, was blissfully unaware of the black clouds of discontent that were gathering menacingly behind him.

a. Comma splice

b. Pronoun reference

?. Misplaced modifier

d. Subject-verb agreement

e. Verb tense shift

_____________________________________________________

According to me the answer is C because the paragraph contains only a misplace modifier at " gathering menacingly " . Other than that it looks fine. What do you think ?