Out of the following given choices;
A) her sex.
B) how tall she is.
C) how long her hair is.
D) the color of her eyes.
The answer is C. The length of hair is not determined by genetics but rather by the time period of the growth phase (anagen phase) of the hair follicle, before shedding in the telogen phase. The longer the anagen phase the longer the hair will be before shedding. The hair on the head has longer anagen phase compared to hair in regions such as the eyebrows.