Pull the wool over (someone’s) eyes

Do you know the English expression “to pull the wool over (someone’s) eyes“? Read the conversation below. Can you guess the meaning?

Sandra: My son told me that he had done all his summer homework, but his teacher called me today and said that he hadn’t done anything!

Anna: I don’t think he expected the teacher to call you. He thought he could pull the wool over your eyes!

Does it mean:

a) put wool in someone’s eyes

b) blind someone

c) do something when the other person isn’t looking

d) deceive someone

The answer is below!↓

gray yarn ball

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Answer: d) deceive someone