For centrifugal pump impeller, the maximum value of the vane exit angle is?

• A. 10¬¨‚àû to 15¬¨‚àû
• B. 15¬¨‚àû to 20¬¨‚àû
• C. 20¬¨‚àû to 25¬¨‚àû
• D. 25¬¨‚àû to 30¬¨‚àû