Question

storm said the spin plain puts on a ball makes it hard to predict its trajectory.
source: seattle times
in this sentence, trajectory means:
uselessness as a consequence of having no practical result
an event indicating important things to come
the path followed by an object moving through space
an intermediate scale value regarded as normal or usual

Explanation:

The word "trajectory" is related to the movement of an object. In the context of a ball being spun, it refers to the path the ball takes. The first option about uselessness is not related to movement. The second option about an event indicating future things is also not relevant. The fourth option about an intermediate value is not about a path.

Answer:

C. the path followed by an object moving through space