In the pea plant, purple colour of the flower is dominant over white colour. Progeny obtained by crossing pure purple-flowered plants with white-flowered plants are self-pollinated. The resulting plants produced are:
A. All purple flowered plants.
B. Purple flowered plants and white flowered plants in a 3 : 1 ratio.
C. Purple flowered and white flowered plants in equal numbers.
D. All white flowered plants.