Oxymoron~I'm confused

From what I know, oxymoron occurs when two words are used together which have, or seem to have, opposite meanings. I'm really confused with this question

Which of the following sentences contain oxymoron?
(i) I had to explain the situation again to her. She clearly misunderstood my genuine intention to help her.
(ii) Diana hates her new colleague, Bill. Everyone knows he is a bully and everyone is scared of him. She can only give a silent scream whenever she sees him.
(iii) To her surprise, the party was attended by only a few people. It was indeed a small crowd.
(iv) Melody and lyrics are important elements of soft rock music.
Choose one answer.
a. (ii), (iii) and (iv)
b. (i), (ii) and (iii)
c. All the above
d. (i), (ii) and (iv)

Is C correct?