Using treasury instruments as a benchmark, calculate the credit spread for BBB rated corporate bonds based on the following information on yields for various bonds:

BBB rated 10 year Corporate bond= 8%

AAA rated 10 year Corporate bond= 5.5%

10 year Treasury bond= 3%

1 month Treasury bill= 1%

A: 3%

B: 2.5%

C: 7%

D: 5%