It would be 100%. As you can see in my punnet square, there are no boxes with ww, which means that ll of the flies would have curled wings. (this is because you have to have two recessive genes for that gene to show)
So it would be
A. 100%
Tryptophan self-controls its synthesis. If we have a large amount of tryptophan in the sense that it exceeds, tryptophan would act as a co-repressor which prevents synthesis of more enzymes for its production. Hope this answers the question.
One way to reduce water consumption on farms is to use drip irrigation. Drip irrigation is a way of watering the plants in the farm directly to their roots. By this less water are consumed and you are sure that the plant really received the amount of water that they need.