Which excerpt from "the chrysanthemums" foreshadows elisa's feelings of being trapped?

a. she looked toward the river road where the willow-line was still yellow with frosted leaves so that under the high grey fog they seemed a thin band of sunshine.
b. the country road ran along the dense bank of willows and cotton-woods that bordered the river.
c. on every side it sat like a lid on the mountains and made of the great valley a closed pot.
d. the thick willow scrub along the river flamed with sharp and positive yellow leaves.