Y = number of members who attend yoga sessions
S = number of members who attend strength training sessions
Goal: Is Y>S?
Statement (1):
This tells us that yoga attendees are not exclusive—they also attend other types of sessions, possibly including strength training, cardio, etc. But we don't know how many people attend yoga.We don’t know what the "other types" of sessions are.We don't know how many attend strength training.
Statement (1) alone is insufficient.
Statement (2):
This is stronger: it tells us that all yoga attendees are a subset of strength training attendees, the number of yoga attendees is not greater than the number of strength training attendees.
Statement 2 is sufficient because if all yoga attendees are also in strength training, then yoga count cannot exceed strength count.
So Statement (2) alone is sufficient.
(B) Statement (2) alone is sufficient, but statement (1) alone is not sufficient.