Ebbinghaus' Use of Nonsense Syllables to Study Memory Led to the Discovery

Ebbinghaus' use of nonsense syllables to study memory led to the discovery that

A) the amount remembered depends on the time spent learning.
B) what is learned while in one mood is most easily retrieved when in that same mood.
C) information that is automatically processed is rarely forgotten.
D) our sensory memory capacity is essentially unlimited.