Answer: (A) inelastic
Explanation: In inelastic demand it states that by increasing the cost price it will create a proportionality in the total revenue ,that is revenue will also increase.In this case the demand of the buyer does not change, only the cost changes and the consumer will keep on buying the goods even after change in price.
Opera Estate Girls' School is also using this technique to increase the revenue,by increasing the tuition.Thus the correct option is option (A).