please help!!!

Raquel measures the height of a plant as it grows. It is 3 cm tall when she first measures it, and it grows 0.5 cm per day. Let H represent the height of the plant, and let D represent the number of days since Raquel started measuring the height. Write an equation relating H to D.

D equals 0.5 plus 3 H

D equals 3 plus 0.5 H

H equals 0.5 plus 3 D

H equals 3 plus 0.5 D