From which structures would enzymes R, S, T, and V respectively be secreted?

From which structures would enzymes R, S, T, and V respectively be secreted?
Hint:
Remember:
·       Osmosis is the movement of water from a higher concentration to an area of lower concentration.
·       Tubular secretion is a term you will study in the kidney unit and applied to nephron tubules secreting substances into urine (the tubules) for excretion.

a. Pancreas, stomach, small intestine, and salivary glands.
b. Duodenum, pancreas, stiomach and small intestine.
c. Salivary glands, pancreas, stomach, and small intestine.
d. Small intestine, pancreas, stomach and duodenum.