According to the Authors,every Time We Make a Decision,we Experience

According to the authors,every time we make a decision,we experience some amount of dissonance.Why?

A) The rejected alternative is seldom completely positive.
B) After people invest effort, they are motivated to second-guess themselves.
C) People seldom seek out objective information before decision-making.
D) People often make the wrong decision.
E) The chosen alternative is seldom completely positive.