Dan's memory stores—sensory memory

Which of Dan's memory stores—sensory memory, STM, or LTM—do you think was most affected by his friend's talk? Why? Could Dan have done something different to keep from forgetting the phone number? Explain.
Melissa was disappointed after she received yet another D on a test. She had studied for several hours by reading and rereading her textbook and class notes.

Based on the LOP memory theory, why is Melissa's study not effective? What could she do differently? How?