Which of the Following Statements Is True of High-Copper Amalgams

Which of the following statements is true of high-copper amalgams in contrast to low-copper amalgams?

A) High-copper amalgams have more of the gamma-2 product than low-copper amalgams.
B) High-copper amalgams are more durable than low-copper amalgams.
C) High-copper amalgams have more deterioration at the margins than low-copper amalgams.
D) High-copper amalgams have more corrosion than low-copper amalgams.