In statement given below, a part of the sentence is enclosed in quotation marks. Below are given alternatives to the quotes part which may improve the sentence. Choose the correct alternative. In case no improvement is needed, option 'D' is the answer."The more they earn, more they spend."

• A. More they earn, more they spend
• B. More they earn, the more they spend
• C. The more they earn, the more they spend
• D. No improvement