The Graph of a Certain Function $y = f ( x )$

Multiple Choice

The graph of a certain function $y = f ( x )$ and the zero of that function is given. Using this graph, find a) the $x$ -intercept of the graph of $y = f ( x )$ and b) the solution to the equation $f ( x ) = 0$ .
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A) a. 15
b. $x = 15$
B) a. 15
b. $x = 0$
C) a. 0
b. $x = 15$
D) a. 15
b. $x = - 15$