According to the Turing Test

According to the Turing test:

A) when a human can solve a computational problem as quickly as a computer,the human can be considered intelligent
B) if an observer cannot differentiate between the answers to questions given by a human and those given by a computer,the computer can be said to think
C) a computer must score at least 100 on an IQ test in order to be considered intelligent
D) it must be demonstrated that a computer understands what it is doing before it can be said to think