Final answer:
Two events E and F are considered independent if the likelihood of one event occurring does not affect the likelihood of the other event occurring.
Step-by-step explanation:
Two events E and F are considered independent if the likelihood of one event occurring does not affect the likelihood of the other event occurring. In other words, if events E and F are independent, then knowledge of one event does not provide any information about the other event. Therefore, the correct option is C. E and F are independent events.