The observations that Turner’s individuals appear female and Klinefelter’s ... ...

The observations that Turner’s individuals appear female and Klinefelter’s individuals appear male may give us information about sex determination in humans. From this information, we can tell that:
(A) Sex is determined by the number of X chromosomes (l=male, 2=female).
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in 18. Reproductive Systems, Gametogenesis, and Early Development