Giacomo is experiencing tolerance of methamphetamines.
Since Giacomo has been taking methamphetamines for a while, he has built up tolerance of the drug, causing him to take more to feel the effects.
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I believe the answer would be: B
Because, proprioceptive neuromuscular facilitation is a method of stretching muscles to maximize your flexibility. This is usually done with a partner and involves series of contractions as well as relaxations.
Hope this helps
Could you give us the answer choices? It says 'which'... That should mean there are multiple answer choices.