Refer to the Figure Above and Then Answer the Question

Refer to the figure above and then answer the question that follows.
-In his basic experiments, Mendel began with true-breeding parental (P) plants. What did he see when he cross-fertilized P plants that had different traits?

A) The F₁ plants had new traits that were a blend of P traits.
B) All F₁ plants had the trait of one or the other P plant.
C) The F₁ plants had an entirely new trait, not seen in either P plant.
D) The F₁ plants showed a combination of the two P traits in a 1:1 ratio.
E) The F₁ plants showed a combination of the two P traits, in a 3:1 ratio.