Question 46: 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.
smell (v): to smell, to smell
+ smell is a linking verb, so it is followed by an adjective.
Hence: sweetly => sweet
There are 20 species of wild roses in North America, all with spiky, hairy leaves and large, often radiating flowers.