Which of the Following Is the Best Example of the Use

Which of the following is the best example of the use of puffery in advertising?

A) Central Bank advertises free checking with a minimum balance of $1,000.
B) Michelin advertises a 50,000-mile guarantee for its tires.
C) Godiva claims that it makes the finest chocolates in the world.
D) Head & Shoulders shampoo advertises that it has been proven to be effective in preventing dandruff.
E) Federal Express advertises guaranteed overnight delivery service.