Cells that secrete hormones into the bloodstream which are then carried away to target cells are referred to as cells.
a. paracrine
b. endocrine
c. autocrine
d. exocrine

b. endocrine

Paracrine cells are the ones that secrete a sign directly to its neighbors, to the extra cell space and not to the blood.

Endocrine cells are the ones that secrete a hormone to the blood system to be distributed to some specific place in the body.

The autocrine system is the release of a hormone from the cell to that same cell.

The exocrine glands are those who release a specific type of hormone or enzyme to some part of the body, through canals.