LSAT Practice Test 2026 – 400 Free Practice Questions to Pass the Exam

If B doesn't swim immediately after F, it means that there is at least one person between F and B in the swimming order. The only option that must be true given this condition is that R is not the first to jump into the pool. This is because if R were to jump first, there would be no one between F and B, violating the initial condition. Therefore, the correct answer is D.

Options A, B, and C do not necessarily have to be true based on the information provided in the question and the specified condition.