Tree-Set-and-List

What values will treeSet contain at the end of the program?

A	J, A, V, A, , P, R, O, G, R, A, M, M, I, N, G
B	J, V, A, , P, R, O, G, M, I, N
C	J, V, , P, O, I, N
D	J, V, A, P, R, O, G, M, I, N
E	Compilation Error or Runtime Error

Tree Set and List - Java Quiz Question