To determine the validity of the third statement, let's analyze the given information:
Statement 1: Class A has a higher enrollment than Class B.
Statement 2: Class C has a lower enrollment than Class B.
From these two statements, we can infer that Class A > Class B > Class C.
However, the third statement contradicts this order by stating that Class A < Class C. Since this contradicts the previous information, the third statement must be false.
Therefore, the correct answer is B) false.