The correct answer is option D - Causation explains a direct connection between events, while correlation explains an indirect connection between events.
Causation is the relation between two simultaneous or successive events, when the first event, which is the cause, brings about the other, which is the effect. That means that one event is the result of the occurrence of the other.
Correlation, on the other hand, is a connection or link between things. But one does not necessarily bring the other.
Finally, it is important to say that correlation does not imply causation.