The Most Reasonable Conclusion Concerning the Decay of Short-Term Memories

The most reasonable conclusion concerning the decay of short-term memories is that

A) memories are either stored in long-term memory or forgotten in about 18 seconds.
B) all types of information in short-term memory decay at the same rate.
C) there is no research evidence that supports the decay hypothesis.
D) some types of information of current concern can be maintained and updated for longer than 18 seconds even without constant rehearsal.