According to the levels-of-processing principle, certain memories are easy to recall because we

A) repeated them over and over to concentrate mostly on their sound.
B) thought about their meaning while we were storing the memories.
C) held them for an unusually long time in short-term memory before transferring them to long-term memory.
D) stored them in the deepest layers of the cerebral cortex.

The levels-of-processing principle states that the more deeply we process information during encoding, the better we will remember it. This means that we are more likely to remember memories that we have thought about their meaning while storing them, rather than simply repeating them over and over or holding them in short-term memory for an extended period. While the cerebral cortex is involved in memory storage, simply storing memories in the deepest layers is not enough to guarantee easy recall.