What kind of context clue is used in the sentence "Perhaps

What kind of context clue is used in the sentence "Perhaps the most startling theory to come out of kinesics, the study of body movement, was suggested by Professor Bird Whistell"?
A、Explanation.
B、Definition.
C、Example.
D、Synonymy.
【正确答案】：B
【题目解析】：本题考查第八章提供线索来猜测题意的方法，一共有definition，explanation, example, synonymy, antonymy, hyponymy, relevant detail, word structure八种，因此需要详细学会辨析这八种方法和例子。题干中给出了kinesics, 又紧着着说了the study of body movement, was suggested by Professor Bird Whistell，符合对定义的解释说明，因此选择B定义。