Working through Graded Go Problems for Beginners Volume 1 by Kano Yoshinori 9p published by Kiseido, I found what looks to me like a solution to problem #155, but it is not the given solution.
Problem 155. Black to play. (1 move)
How can Black kill the white group?
The given solution is A. I thought it was B, which isn’t discussed in the answer section. C is the wrong move, which is discussed.
Is B also correct, and if not, why not? Playing it out it looked okay to me, but perhaps I missed something or A is better?