What Was One Reason That Lords Were Inclined to Let

What was one reason that lords were inclined to let serfs sell surplus crops in towns?

A) Serfs could use the profits to buy privileges,and lords needed the money to maintain their standard of living.
B) If the lord's household could not consume the surplus food,it would have to be wasted regardless.
C) The active economy this trade created made the town a good place for lords to buy goods as well.
D) Lords needed to keep their workers on the farm to keep the manor going.
E) It was inconvenient and inefficient for the lord to attempt to sell the surplus crops himself.