Using translation concepts, the function whose graph is plotted is given by:
y = 0.5cos(x).
What is a translation?
A translation is represented by a change in the function graph, according to operations such as multiplication or sum/subtraction in it's definition.
In this problem, the y-intercept is different of zero, hence it is a cosine function. The amplitude is of 0.5, hence the function is multiplied by 0.5, that is, y = 0.5cos(x), which means that option C is correct.
More can be learned about translation concepts at https://brainly.com/question/4521517
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