单项选择题:
Krashen identifies three kinds of affective variables related to second language acquisition: （）.
A．motivation, self-confidence and anxiety
B．prehension, acquisition and anxiety
C．input, petence and self-confidence
D．situation, motivation and self-confidence
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答案：A
解析:克拉申在其提出的情感过滤器假设(Affective filter hypothesis)中确定了三种可变的情感因素与第二语言的习得有关，包括动机(motivation)、自信(self-confidence)、忧虑(anxiety)。这三种情感因素影响了语言的学习速度。