Place the following events in order:
a) TRH stimulates the anterior pituitary
b) Low TH levels stimulate the hypothalamus
c) The hypothalamus releases TRH
d) The anterior pituitary releases TSH
e) TSH stimulates the thyroid gland
f) The thyroid gland produces TH
a) 3c, 1a, 4d, 2b, 5e, 6f
b) 4d, 3c, 1a, 2b, 5e, 6f
c) 2b, 3c, 1a, 4d, 5e, 6f
d) 3c, 1a, 2b, 4d, 5e, 6f