Correct Answer:
B. (B) Sift
To winnow means to separate desirable parts from undesirable ones, or to sift. Therefore, Sift is the accurate synonym. "Fuse" means to join, "Espouse" means to adopt or support, and "Gather" means to collect, none of which convey the meaning of separation.
The word “winnow” means to remove the bad or less desirable parts from a group or mixture, often by using a process of separation. In agriculture, it specifically refers to separating grain from chaff using the wind or a current of air.
Sift: This means to separate or sort out, often by passing through a sieve or similar process. It is very similar to winnowing, as both involve separating desired elements from undesired ones.