The correct answer is C. Tolerance
Step-by-step explanation:
Drug tolerance occurs as the user of a drug needs larger doses to get the same desired effect. This occurs because the repeated use of a drug causes the body of the individual to adapt and tolerate the drug, and therefore the effect of the drug becomes weaker over time. This causes the individual to use higher doses of the drug and makes withdrawal even more difficult. Sophia is experiencing tolerance because she needs to take larger and larger amounts of the drug to feel as high as before, which means now her body is tolerant or less sensible to the drug due to constant use of it.