There are four friends: A, B, C and D. They are musicians, scientists, astronomers and logicians. When they were young, they used to predict the future together. At that time, a predicted that I could not become a scientist anyway. B predicted that C would be a logician in the future. C predicted that D would not become a musician. D predicted that B could not become an astronomer. In fact, Only the logician predicted correctly.
A is a logician, B is an astronomer, C is a scientist, and D is a musician is correct.