1) Many people know that advertisements exaggerate their claims, so a company is not being unethical by implying that a sugary food will "enhance sports performance.” (2) For example, energy bar advertisements often feature famous athletes. (3) However, no reasonable person thinks he or she can run or jump like an athlete just by eating an energy bar. (4) In fact, in one study, only 21% of respondents thought that advertisements were truthful. (5) Furthermore, one expert says that energy bars "can be a helpful part of your diet.”

Which sentence contains ineffective evidence and should be eliminated from this paragraph?

sentence 2
sentence 3
sentence 4
sentence 5