Why Did Several of Ebbinghaus's Findings Differ from Those of Later

Multiple Choice

Why did several of Ebbinghaus's findings differ from those of later investigators?​

A) Ebbinghaus did all his research on his own memory.
B) ​Ebbinghaus studied memory of Greek words, which were unfamiliar to later participants.
C) ​Later studies had to change the procedures for ethical reasons.
D) ​Most of the later investigators tested mental patients, whose memory was impaired.