In each of the questions given below a/an idiom/phrase is given in bold which is then followed by five options which then tries to decipher its meaning as used in the sentence. Choose the option which gives the meaning of the phrase most appropriately in the context of the given sentence.

Q:

She might not be the most attractive but you can’t judge a book by its cover. I’m sure she is a sweetheart.

• 1
  to prove someone innocent
• 2
  to make someone a cheater
• 3
  to select a book by seeing its contents
• 4
  to select a book by its quantity
• 5
  to not judge someone or something based solely on appearance