Choose the word or set of words that, when inserted in the sentence, best fits the meaning of the sentence as a whole.
题目：A ------- person, he found the training almost unbearably monotonous, but he resolved to check his ------- and perform the basic tasks required.
( A ) bitter . . submissiveness
( B ) reclusive . . reserve
( C ) dynamic . . restlessness
( D ) mercurial . . constancy
( E ) vivacious . . ambition
Choice C is correct. （正确答案为：C）
It is logically consistent to say that someone who is “dynamic,” or energetic, would feel restless, or agitated, when faced with a boring task.