【单选题】

When Steve McDougal says "It's not a financial hardship, but it is an incremental amount of money that's not required," she means that ______.
A．(A) Green tag costs a lot of money.

B．(B) Green tag costs an extra amount of money.
C．(C) Green tag's is cost-effective.
D．(D) The cost on green tags is far less than the companies pay to purchase renewable power from suppliers.