You should plan ahead better. One Hour? Really!
Really Big Hint:
Compare A to B
Scale A: 34-10 = 24
Scale B: 31-15 = 16
It appears that B moves less than A in the ratio 16/24 = 2/3. So, B moves 2/3 times the movement of A.
Compare B to C
Scale B: 42-30 = 12
Scale C: 77-5 = 72
It appears that C moves more than B in the ratio 72/12 = 6. So, C moves 6 times the movement of B.
Okay, move A 18º and see what B does. Then see what C does.
Alternatively, you can do the tiny bit of algebra and relate A nd C directly.