Male body cells only have one X chromosome, while females have two X chromosomes. It is hypothesized that if both X chromosomes of a female were active and functioning, they could cause metabolic dysfunction.
Which of the following helps prevent this from occurring?

(Choice A)
A
Each X chromosome takes a turn being active in a cell.

(Choice B)
B
Barr bodies are used to dissolve the extra X chromosome so that only one X remains.

(Choice C)
C
X-inactivation "switches off" one of the X chromosomes.

(Choice D)
D
The second X chromosome is converted into a smaller Y chromosome.