Proactive interference of long-term memory means ______.

A) new material interferes with memory of old material
B) new material has suppressed short-term memories
C) old material interferes with memory of new material
D) old material has eliminated memories of new material

Proactive interference of long-term memory occurs when previously learned information interferes with the ability to learn and retain new information. This means that old material is causing interference with the memory of new material, as opposed to new material interfering with old material (option A). Option B is referring to retroactive interference, not proactive interference. Option D is also incorrect as it suggests that the old material is eliminating memories of new material, which is not the case.