C is 3rd from the top and D is 4th from the bottom in a group of 15 people. What is the total number of people in the group?

Answer: A. 15
If C is 3rd from the top, then there are 2 people above C. If D is 4th from the bottom, then there are 11 people above D. Since C and D are in the same group, the total number of people is 15.