Mark the letter A, B, C, or D on...

Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.
His tenacious personality made him top salesperson in the company.

A. explosive        

B. charming          

C. tenable    

D. persistent