A farmer noted that many of his tomato fruits turned brown at the ...

[Hungry!]

A farmer noted that many of his tomato fruits turned brown at the base as they ripened. The following spring when he replanted, seedlings only grew for a few weeks before the apical tips of many of the plants turned brown and the plants ultimately died. The most likely explanation for this observation is a soil deficiency in
A) nitrogen.
B) phosphorus.
C) potassium.
D) calcium.
E) magnesium.

[clippers!]

I know it's D,

Have a wonderful day