Answer:
"How are you out of breath when you have enough breath to tell me that you are? The pause you are taking with your excuse is longer than the (action that they are excusing) itself."
Essentially.
Answer: A vassal was given the rights to control the fief and to have ownership of it.
A knight may serve a serf in exchange for horses.
The two statements chosen above are not true. The vassal does not have the right to control or even own a fief and the knight also cannot serve a serf in exchange for horses or anything.
The correct answer would have to be B didactic