The correct option is D Morgan
Thomas Hunt Morgan discovered mutation of white-eyed in fruitfly and was awarded Noble prize for this in 1933. Normally these flies have red colour eyes but he noticed that few male flies have white colour eyes. He immediately crossed these flies with wild flies i.e., red-eyed flies and observed that the F1 generation has only red-eyed flies but when he selfed these flies he saw the ratio is3:1. Thus, the correct option is B