Glucose in the bloodstream is a large molecule that cannot readily enter a cell unless it binds with insulin. This BEST describes:

a. Osmosis
b. Diffusion
c. Carrier-mediated diffusion
d. Absorption

c
Rationale: a. Osmosis involves the movement of solvent, normally water.
b. Diffusion is a general term related to the movement of substances and involves both active and passive forms, of which carrier-mediated diffusion is included.
c. Carrier-mediated diffusion most correctly explains the process described.
d. Absorption encompasses a medications progress from its pharmaceutical dosage form to a biologically available substance that can then pass through or across tissues.