Smoking cigarettes is a leading cause of many diseases. The government has opened several public clinics that treat smoking-related diseases and is trying to decide how to fund these clinics. 2.2. Another suggestion is to get the funds for the public clinics from a cigarette tax. This tax follows ____.
A. The benefits principle
B. Neither the ability-to-pay principle nor the benefits principles
C. Both the ability-to-pay and benefits principles D. The ability-to-pay principle