According to Delaney, Sahakyan, Kelly and Zimmerman's (2010)results, Doing What

According to Delaney, Sahakyan, Kelly and Zimmerman's (2010) results, doing what after studying a list of unrelated words REDUCED memory for that list the most on a later test?

A) Daydreaming about a domestic trip
B) Daydreaming about a international trip
C) Reading aloud from a psychology textbook
D) Rehearsing the words on the list
E) Imagining the words from the list interacting with each other