That choice will be the correct response to the question. Consider the following GMAT-style argument. These statistics clearly show that during the past year consumers have become less concerned about their health and level of fitness. This same argument could be used for any of the three question types. If not, let's do some brainstorming.
People join fitness clubs because they are concerned about their health.
Membership in fitness clubs is the only means by which consumers demonstrate their concern for fitness. Renewal rates at fitness clubs are not increasing. Additional unstated assumptions might occur to you as well. You can take any one of these assumptions and draft it as the best answer choice for any of the three question types. People join fitness clubs for the primary purpose of socializing with other club members.