The Recency Effect Found in a Serial Position Curve Can

The recency effect found in a serial position curve can be eliminated if

A) subjects rehearse all words equally often, suggesting that the recency effect is caused by retrieval from STM.
B) subjects rehearse words equally often, suggesting that the recency effect is caused by retrieval from LTM.
C) subjects perform another task for 30 seconds, suggesting that the recency effect is caused by retrieval from STM.
D) subjects perform another task for 30 seconds, suggesting that the recency effect is caused by retrieval from LTM.