Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

There (A) are twenty species of wild roses in North America, all of which have (B) prickly stems, pinnate leaves, and large flowers, (C) which usually smell (D) sweetly.

A. are

B. prickly 

C. which 

D. sweetly