John buys a toy plane from a toy store the money he pays the a) does not affect b) is injected back into c) leaks out the economy through a)the employees' wages b)the importation of new toys c) the sales of similar and the taxes paid by the store.

The complete sentence is as follows:
John buys a toy plane from a toy store. The money he pays the store IS INJECTED BACK INTO the economy through THE EMPLOYEES' WAGES and the taxes paid by the store. 
When customers buys goods or service from a company, the money paid by the customers are usually used by the company to keep the company rolling. Keeping the company rolling involves putting in place everything that will ensure smooth operations. These include prompt payment of workers' salaries and payment of taxes to the government; by this means, the money pay by the customers are injected back into the economy.

Ithink the answer is d.