If demand is unitary elastic, a 25% increase in price will result in

The correct answer is A. 25% change in total revenue.

Unitary elastic demand means that the percentage change in quantity demanded is equal to the percentage change in price. In other words, if the price increases by 25%, the quantity demanded will decrease by 25%. This will result in a 25% change in total revenue, because the price and quantity demanded are changing by the same percentage.

Option B is incorrect because a 25% increase in price will not result in no change in quantity demanded. If demand is unitary elastic, a 25% increase in price will result in a 25% decrease in quantity demanded.

Option C is incorrect because a 25% increase in price will not result in a 1% decrease in quantity demanded. If demand is unitary elastic, a 25% increase in price will result in a 25% decrease in quantity demanded.

Option D is incorrect because a 25% increase in price will not result in a 25% decrease in quantity demanded. If demand is unitary elastic, a 25% increase in price will result in a 25% decrease in quantity demanded.