Advertisement :
"You cannot buy a more potent pain reliever than RELIEF without a prescription"

Which of the following statements is inconsistent with the claim made by the advertisement ?
I. RELIEF is not the least expensive non prescription pain reliever that is widely available for sale
II. Another non prescription pain reliever , TOBINE is just as powerful as RELIEF and is available at lower cost
III. Some pain relievers are more powerful than RELIEF
A. I only
B. II only
C. I and II only
D. I, II and III
E. None of the statements is inconsistent with the advertisements