The answers A and C contain correct information but both of them provide different advice. so the answer is literally your opinion between a and c
The ratios are both identical
sin x = perpendicular/hypotenuse = 3/5
cosy = base/hypotenuse = 3/5
They have an called that can help you with this. All you do is type in your problem and it gives you an answer. If it doesn't work there are plenty of other apps that can help. Good luck!!