Final answer:
Claudio and Don Pedro were fooled in the garden due to deception arranged by Don John in Shakespeare's 'Much Ado About Nothing' where they mistakenly believed Hero was unfaithful.
Step-by-step explanation:
The question 'Why were Claudio and Don Pedro fooled in the garden?' seems to refer to a scene in William Shakespeare's play Much Ado About Nothing, where Claudio and Don Pedro are tricked into believing that Hero is unfaithful. This deception occurs when Don John, the antagonist, arranges for Claudio and Don Pedro to overhear a conversation meant to make them think Hero loves another man. The scene plays on themes of deception, appearance versus reality, and eavesdropping.