Discussion
For which suspect (s), must their respective second statements be true ?
Answer: C
The second statements must be true for B and C only.
From the solution of this set: B's second statement (playing cards with C) is true, because his first, 'A is the murderer', is false. C's second statement, 'B is innocent', is true. D's second statement, 'B is the murderer', is false, since D's true statement is 'C is innocent'. For A, it cannot be determined which statement is true, so A's second statement is not necessarily true.
So 'D only' is wrong, 'C only' leaves out B, and 'A, B and C only' wrongly includes A.
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