Answer
Statement (d) is correct.
Work Step by Step
Since the sky diver is falling with a constant velocity, there is no acceleration and the sky diver is indeed in equilibrium. But it does not mean there are no forces acting on the diver.
In fact, there are at least 2 forces affecting the motion here: the downward gravity force and the upward force of the parachute. Since these two balance each other, $\sum F=0$ and there is no acceleration as a result.
Statement (d) is correct.
