Please Use the Following Information to Answer the Question(s) Below

Please use the following information to answer the question(s) below.
In a particular plant, leaf color is controlled by gene locus D. Plants with at least one D allele have dark green leaves, and plants with the homozygous recessive dd genotype have light green leaves. A true-breeding dark-leaved plant is crossed with a light-leaved one, and the F1 offspring is allowed to self-pollinate. The predicted outcome of the F2 is diagrammed in the Punnett square shown in Figure 11.1, where 1, 2, 3, and 4 represent the genotypes corresponding to each box within the square. Figure 11.1
-Which of the boxes correspond(s) to plants with a heterozygous genotype?

A) 1 only
B) 1 and 2
C) 1, 2, and 3
D) 2 and 3
E) 2, 3, and 4