In Peas, the Yellow Seed Color Is Dominant (YY or Yy)

Multiple Choice

In peas, the yellow seed color is dominant (YY or Yy) over the green seed color (yy) . You have been given a plant that only produces yellow seeds and need to determine if the plant is YY or Yy. Which of the following crosses would be most effective for determining the genotype of your plant?

A) your plant × a plant that produces only green seeds
B) your plant × another plant with known genotype YY
C) your plant × another plant with known genotype Yy
D) No cross is necessary. You should just plant your yellow seed and see what color flowers it produces.
E) There is no way to determine the genotype of your plant.