Answer: A. People can grow overly dependent on one another.
There are many reasons why people decide to stay together. One of them is dependence, or habit. This is the idea that the excerpt tries to convey. In this excerpt, we witness an exchange between Hamm and Clov. Both of them state that the only reason why they are with each other is because there is no one else. In other words, they are so dependent on each other that they cannot be on their own, and they have no one else to be with. This shows how people can grow overly dependent on one another.
