Based on the thesaurus entry and how the word is used in the paragraph, which word is the closest meaning for circulation and why is that meaning the best choice?

i’m giving grandma a pair of mittens and booties i knitted for her to keep her warm. she has poor circulation and feels cold all the time. the blood in her body doesn’t travel well to her extremities, so her hands and feet are always cold. whenever grandma touches my cheek, i jump because her hand feels icy cold.

read the thesaurus entry.

circulation, n. delivery, distribution, flow, movement

a.
delivery

it tells how the grandmother touches the girl's cheek.

b.
distribution

it tells how the girl is giving her grandmother mittens and booties.

c.
flow

it explains how blood is supposed to move through our bodies.

d.
movement

it explains how the blood doesn't travel well in grandma's body.