Q56-60: In a talk show, there are 7 chairs in a row - opposite to the host of the program. Seven discussants - A, B, C, D, X, Y, and Z will…

Q56-60: In a talk show, there are 7 chairs in a row - opposite to the host of the program. Seven discussants - A, B, C, D, X, Y, and Z will participate in the talk show. The chairs are numbered 1 to 7 from left to right. The sitting plan must be done according to the following conditions: A must occupy 1st, 2nd or 3rd chair. C must sit immediately before B. D cannot sit in the 1st or last chair. X must sit either in the 1st or last chair. Y must be on one of the last three chairs.

If C occupies the 1st chair, who could occupy the fourth chair?

1. a) A
2. b) B
3. c) D
4. d) Y