A horticulturist wants to use selective breeding to produce a dahlia plant with large, double-petalled, bright yellow flowers.
The table below shows the characteristics of three different varieties of dahlia plants.
| Characteristic | Variety A | Variety B | Variety C |
|---|---|---|---|
| Flower size | small | large | large |
| Petal type | single-petalled | double-petalled | single-petalled |
| Flower colour | bright yellow | deep red | pale white |
Explain which plant varieties the horticulturist should breed together.
