问题：
[单选题]Which of the following is wrong about cognitive psychology?
ACognitive psychology is a branch that focuses on internal state, such as motivation, problem solving, decision making, thinking and attention.
BArtificial intelligence is an area based on computer science but not psychology.
CCognitive psychology emerged in the1960s.
DCognitive psychologists started to use metaphor of computer to our mind after personal computers appeared.
答案解析：