Ican"t figure this one !

steven recorded the growth of a plant over 10 wk for his science project. he made a graph that shows how much the plant grew each week. the plant was 2 in. tall when steven started his project. at week 5, the plant was 8 in. tall. complete the equation that represents steven’s situation.
y= x+

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

it is either c or d and i know for sure it is not a or b