Prick up (one’s) ears

Do you know the English expression “to prick up (one’s) ears“? Read the conversation below. Can you guess the meaning?

Wendy: Did the children listen in class today?

Denise: Yes, they pricked up their ears when I told them they had an important test next week.

Does it mean:

a) touch one’s ears

b) listen carefully

c) stop listening

d) lift one’s ears

The answer is below!↓

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Answer: b) listen carefully