Under a program called the Emissions Trading​ Scheme, the governments of European Union member nations establish overall targets for greenhouse gas emissions and issue​ __________, or​ permits, authorizing companies to emit certain amounts. In​ theory, an increase in the market clearing price of​ __________ should induce firms to develop methods of​ __________ their emissions of greenhouse gases.
A. allowances; allowances; reducing
B. vouchers; pollution; eliminating
C. allowances; allowances; eliminating
D. vouchers; pollution; reducing