The correct answer is (b), mischief. Mischief is an act that intentionally or recklessly causes damage to property. In this case, A caused cattle to enter upon Z’s field, intending to cause damage to Z’s crops. This is a clear act of mischief, and A is guilty of the offence.
Cheating is an act of deceiving someone in order to gain an advantage. In this case, there is no evidence that A deceived Z in any way. Therefore, A is not guilty of cheating.
Dishonest misappropriation of property is the act of taking someone else’s property without their permission, with the intention of keeping it. In this case, A did not take Z’s property. Therefore, A is not guilty of dishonest misappropriation of property.
None of these is the correct answer because it does not accurately describe the offence that A committed.