Imagine That a Study of Memory and Aging Finds That

Imagine that a study of memory and aging finds that younger participants correctly recall 55 percent of studied words, older participants correctly recall 42 percent of studied words, and the size of this effect is Cohen's d = 0.49.This effect size indicates that the memory performance of:

A) older participants is approximately half a standard deviation above that of younger participants.
B) older participants is approximately half a standard deviation below that of younger participants.
C) younger participants is approximately half a standard deviation below that of older participants.
D) younger participants is significantly lower than that of older participants.