Answer:
B. Mnemonic
Step-by-step explanation:
Mnemonics is any artificial process used to make memorization more effective. Thus, when the subject is repeating aloud the phone number or even the name of his crush, he is using mnemonic techniques. When you use some graphic organizer to study (schema, synoptic chart, fishbone, mind map etc.), you are also using mnemonic techniques. Thus, memorization techniques are not panacea: they are simple ways to make forgetting less likely.