The correct answer is C.
Deferred revenue expenditure is an expenditure which is revenue in nature but is spread over a number of years. It is usually incurred in the current period but the benefits are enjoyed in the future. For example, the cost of advertising a new product is usually incurred in the current period but the benefits are enjoyed over a number of years as the product is sold.
A is incorrect because it is an expenditure for entertainment of executives, which is not revenue in nature.
B is incorrect because it is past expenditure made by a company now adjusted from the current profit, which is not revenue in nature.
D is incorrect because it is an expenditure which cannot be taken into account due to non-availability of a cash, which is not revenue in nature.
E is incorrect because it is a recurring expenditure of a business organization, which is not revenue in nature.