Ch is lettered A. Therefore, answer space A would be Our society is full of vices. Drug abuse is prevalent among youth. The students misunderstood the question.

Here are the solutions to the questions:

3. The word to find the opposite of is vices.

   • "Vices" refers to immoral or wicked behavior.
   • Option B, "virtues," refers to behavior showing high moral standards. This is the most direct opposite.

   The correct option is B.

4. The word to find the opposite of is prevalent.

   • "Prevalent" means widespread in a particular area or at a particular time.
   • Option A, "rare," means not occurring very often or found in few places. This is the most direct opposite.

   The correct option is A.

5. The word to find the opposite of is misunderstood.

   • "Misunderstood" means to fail to interpret or understand something correctly.
   • Option C, "comprehended," means to grasp mentally; understand. This is the most direct opposite.

   The correct option is C.