The idea for transitions for an equation like this is

where m = slope
h = how much left or right (note the negative)
k = how much up or down
moving 13 down would mean
k = -13
so

D. would be your answer
I’m not quite sure what the function is but if it’s sine the period is pi/8
Answer: 13.3922
Step-by-step explanation:
This is an altitude. Shown by the right angle on the side opposite the point.