A Copper Ore Refinery Pollutes the Water Upstream from a Brewery

A copper ore refinery pollutes the water upstream from a brewery. These are the only two parties involved. The transactions costs of reaching an agreement between the refinery and the brewery are low. The amount of water pollution will be at the efficient level

A) only when the property right to the stream is assigned to the ore refinery.
B) when no one has clear property rights.
C) only when the property right to the stream is assigned to the brewery.
D) when the property right to the stream is assigned to either the refinery or to the brewery.