In the United States in Recent Years, _________

In the United States in recent years, _________.

A) the single largest obstacle to organ transplantation is the scarcity of transplantable organs
B) numbers of transplant candidates on the National Waiting List for a major organ transplant have remained relatively stable
C) numbers of organ donors have declined
D) transplantable human organs can only be recovered from deceased donors
E) numbers of actual organ transplants have declined