Tanya would refrain from littering if everyone else refrained from littering. None of her friends litter, and therefore she does not litter either.

Question: Which one of the following uses flawed reasoning most similar to the flawed reasoning in the argument above?
Options:
A. All residents of the same neighborhood have some goals in common. One group of neighborhood residents wants improvements made to a local park, so some other residents of that neighborhood must share this goal.
B. Anyone who believes in unicorns believes in centaurs. But you do not believe in centaurs, so you do not believe in unicorns either.
C. Anyone who believes in unicorns believes in centaurs. But you do not believe in unicorns, so you do not believe in centaurs either.
D. Anyone who believes in unicorns believes in centaurs. But there is no good reason to believe in centaurs, so a belief in unicorns is unjustified as well.
E. Anyone who believes in unicorns believes in centaurs. But it has been conclusively proven that there is no such thing as a unicorn, so a belief in centaurs is mistaken as well.
Answer: "E"