Let the Cat Out of the Bag - Answer

The answer is A!

Letting the cat out of the bag means to give away a secret

The origin of this phrase dates back to the eighteenth century when it referred to a market-day trick. Piglets were often taken to market in a small sack, or bag, to be sold. The trickster would put a cat in a bag and pretend that it was a pig. 

If the buyer insisted on seeing it, he would be told that it was too lively to risk opening up the bag, as the animal might escape. If the cat struggled so much that the trickster let the cat out of the bag, his secret was exposed.

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