Match the following equation to the correct situation. 30%(b − 15) = 30%b − 4.5
A.
A number of songs are available for download from 30% of b artists.

B.
Last month's electricity bill was 4.5 kW-h less than 30% of this month's bill.

C.
A number of cups of coffee were thrown away by 30% of b senators during 4.5 speeches.

D.
An amount of chili was eaten from 30% of 4.5 less than b bowls.