When two independent pure lines of a flowering with white flowers are crossed, the F1 progeny has purple flowers. The F2 progeny obtained from selfing shows both purple and white flower and it produces flowers with 119 purple coloured and 89 white coloured. What is the ratio purple: white and what conclusions can be made :

A. Two different genes are involved, mutations in which lead to formation of white flowers and the ratio is 9:7

B. These two genes show independent assortment and the ratio is 9:3:4

C. This is an example of complementary gene action and the ratio is 9:3:4

D. This is an example of duplicate genes and the ratio is 9:7

Which of the above conclusions are correct?