Directions: Read the following five sentences, each containing a word highlighted in bold. Determine which sentence(s) correctly use(s) its highlighted word and mark it as your answer.

A. The speaker’s extemporaneous remarks impressed the audience.
B. His acerbic wit was both entertaining and biting.
C. The room was cantankerous with rare and valuable books.
D. The artist displayed a natural proclivity for sculpture.
E. The organization’s intricate structure made decision-making slow.