Final answer:
If a zero is of even multiplicity, then the graph of its function only touches the x-axis at the zero.
Step-by-step explanation:
The correct answer is a) Even.
If a zero is of even multiplicity, then the graph of its function only touches the x-axis at the zero. This means that the graph intersects the x-axis and bounces off, but does not cross it. For example, the graph of y = x^2 has a zero of even multiplicity at x = 0, and the graph only touches the x-axis at that point.