Find the sine function that is represented in the graph.

Choice D). is correct.

Step-by-step explanation:

Given function graph is sinusoidal so let's compare with formula

We know that amplitude is the height from the center line to the peak (or to the trough). From graph we can see that height from the center line to the peak is 20

So amplitude A=20

In that formula, period is given by

From graph we see that period is

So both must be equal

cross multiplying them gives

B=4

Clearly there is no shift so C and D are 0

Now plug these values into formula

Hence choice D is correct.