It is the interaction between people, rather than the events occur in their lives, is the main focus of social psychology.
A. that, that
B. that, which
C. which, which
D. that, what
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(答案→)A. that, that
B. that, which
C. which, which
D. that, what
解析：句意：这是人们之间的相互作用，相比于在生活中的发生的意外，这是社会心理学的主要关注点。第一个that引导定语从句，that做从句的主语，第二个that是强调句式中的要求，在这里interaction做主语，所以不能用其他词代替。故选A。
考点: 考查定语从句的连接词和强调句式的用法。