A: They suspected it of foul play!
Explanation: “Suspected of foul play” means that the police think you did something illegal. The group of birds that include chickens, duck, geese and turkeys are known as fowl. “Foul” and “fowl” sound the same. This joke plays with the word fowl/ foul and is really a lot funnier if spoken, not read. (A foul is also a mis-play in a sport such as basketball. Isn’t English fun!)