Refer to the Figure Showing Male Reproductive Hormones

Refer to the figure showing male reproductive hormones. In analyzing a 16-year old male patient with delayed puberty, it is found that the patient has low levels of serum LH, FSH and testosterone.Based on the figure, it is likely that the source of the problem is

A) in the pituitary gland, (labeled 1 in the figure) .
B) a lack of sensitivity of the pituitary gland to testosterone.
C) in the target organs, (labeled 5 in the figure) .
D) a lack of sensitivity of the hypothalamus to testosterone.
E) in the hypothalamus, (labeled 1 in the figure) .