[A] is false. The expected value when tossing a number cube once is 3.5, which is not contained in the sample space {1,2,3,4,5,6}
[B] is false. The expected value is neither T nor H, so it's not in the sample space of {T,H}.
[C] is true. 5 is the expected value of randomly picking from {1, 2, 3, ...., 9}, so yes
[D] is false. 5.5 is the expected value of randomly picking from {1, 2, 3, ...., 10}, so no
