Context: In a group of ornamental gourd plants, some individuals have yellow fruit and others have green fruit. In this group, the gene for the fruit color trait has two alleles. The allele for green fruit (f) is recessive to the allele for yellow fruit (F).
This Punnett square shows a cross between two ornamental gourd plants.
What is the probability that an ornamental gourd plant produced by this cross will be heterozygous for the fruit color gene?
A. 4/4
B. 0/4
C. 3/4
D. 2/4
E. 1/4
From the given choices, choose the correct answer and respond with the letter of that choice.

D