both red both white one red and one white one white and one pink
I gave my students this multiple choice question: In snapdragon plants, red flowers are dominant to white flowers. When red-flowered plants are crossed with white-flowered plants, pink flowers are produced. If a researcher wants to produce plants with only white flowers, what color should the parent plants be?

Only one answer is correct among these 4 choices:
- both red
- both white
- one red and one white
- one white and one pink

Could you tell me which one is correct?

both white