Which of the Following Is a Central Claim in Shapiro's

Which of the following is a central claim in Shapiro's argument?

A) With easy access to drugs, we can expect a significant increase in drug addiction.
B) Even with easy access to drugs, most drug users don't become addicts.
C) Legal restrictions on drug use are justified because illegal drugs are inherently addictive.
D) Only by restricting access to drugs can we solve the drug problem.