What was the major purpose of improving the roads in nineteenth century America?

the anterior pituitary gland produces the following hormones and releases them into the bloodstream: psychotropic hormone, which stimulates the adrenal glands to secrete steroid hormones, principally cortisol. growth hormone, which regulates growth, metabolism and body       hope i

where is the passage

i cant solve it without knowing the passage

the answers are a b and d