The correct option is A a tragedy
In the soliloquy, here, Edmund is questioning his status as a bastard, questions why should he stand by and let man-made customs deny him of his rights because his the younger son and a bastard. This soliloquy has a serious tone and all the makings of a tragedy. So, we can conclude that the soliloquy belongs to the genre of tragedy. So, option A is the correct answer.