Select the most appropriate meaning of the following idiom Blind alley

Options

A. A person who comes to meet occasionally
B. A situation in which no further progress can be made
C. Taking first step after somebody's approach
D. A state of drop thought

Answer

B

Explanation

Blind alley=a situation or method that is not effective or will not produce results.
Look at the sentence:
Thi sort of thinking just seems to be leading us up/down a blind alley.