Who Is The Most Unethical?

There were 4 people, A, B, C, & D.

A and B loved each other but they lived on either side of a river. In order to meet, A and B had to cross the river on a boat owned by C.

One day, B wanted to meet A but C put a condition that if B wanted to cross the river, they had to spend the night with C.

B agreed.

B met A on the other side the next day and told them about the condition.

After hearing the story, A refused to accept B — to which B started crying.

Soon D passed by and calmly listened to B's story.

D replied by stating “I can't help you in any way” and walked away.

So which of the four is the most unethical?

Is it C, for taking advantage of B's need to cross the river?

Is it B for spending the night even though they loved A?

Is it A for rejecting B?

Or is it D for not caring about B's predicament?

How do you know what gender the characters in this story are? Does spending the night always imply sex? Does loving someone require there to be a couple?

The assumptions we make about this story makes them all seem unethical. Without these assumptions, it's possible that none of the characters acted unethically.