Final answer:
Herman Ebbinghaus discovered the forgetting curve, illustrating that memory for new information decays rapidly initially and then levels off, which means answer option (D) is correct.
Step-by-step explanation:
Herman Ebbinghaus was a pioneer in the field of memory research. He conducted an extensive series of experiments on himself to study memory and forgetting, particularly focusing on the patterns of memorization and loss over time. In his seminal work, Ebbinghaus discovered that memory for new information decays rapidly at first but then levels out over time, a phenomenon now known as the Ebbinghaus forgetting curve.
The correct answer to the question presented is (D): Recall of meaningless information drops very soon after initial learning and then levels off. This encapsulates Ebbinghaus's finding that after an initial period of rapid forgetting, the rate at which we lose memories slows considerably. The work of Ebbinghaus laid the foundation for future research in the field of cognitive psychology and the understanding of memory processes.