Who Is This Man and for What Is He Famous

Who is this man and for what is he famous?

A) George Sperling, who identified the duration of visual sensory memory
B) Hermann Ebbinghaus, who used himself as the sole subject in his pioneering studies of forgetting, and plotted the first forgetting curve
C) Henry Molaison, the man known by his initials, H.M., who had his hippocampus surgically removed more than fifty years ago, producing severe memory deficits
D) Karl Lashley, who attempted to find the specific brain location of particular memories