A Scientist Has a Pea Plant That Produces Yellow Seeds

Short Answer

A scientist has a pea plant that produces yellow seeds. Since yellow is dominant to green, she wants to determine if the plant is homozygous or heterozygous. In order to be certain that she will get conclusive results from a single cross, what is the BEST choice of plant to cross her pea plant with?
A. A green-seeded pea plant
B. A yellow-seeded pea plant
C. A pea plant that produces both green and yellow seeds
D. Itself