Answer:
A. E cannot affect F and vice versa because the people were randomly selected, so the events are independent.
Step-by-step explanation:
Imagine a situation.
We probably live very far from each other
There is a probability that I kill a spider.
There is a probability that you accidentaly swallows a spider.
Or vice-versa.
If I kill a spider, i won't impact the probability that you accidentaly swallows a spider. So these events are independent, and the correct answer is:
A. E cannot affect F and vice versa because the people were randomly selected, so the events are independent.