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Answer:
(b) -6 only
Step-by-step explanation:
There is only one point of intersection of the graph with the vertical line x=0. That is where the graph crosses the y-axis, at (0, -6).
f(0) = -6 (only)
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Additional comment
The fact that f(x) is called a function means that f(0) can have only one value. This eliminates the last two answer choices. The graph crosses y=0 at several points, all having different x-values than x=0. f(0) ≠ 0, eliminating the first choice.
