Event 1 and event 2 are correlated when
a. event 2 occurs before event 1.
b. event 2 leads to a third event.
c. event 1 makes event 2 happen.
d. event 1 has a connection to event 2

The answer is: Event 1 has a connection to Event 2.

A correlation basically implies that there is a connection between two events. The connection may or may not be of a causal nature. What it does specify concretely is that there is a mutual relationship or dependence between those two, or amongst more, events; in other words, this means that there is interdependence between the events in question.  

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