Which table shows a constant rate of change?

A.

Days. 6 12 18

Earnings ($) 225 450 750

B.

Days. 6 12 18

Earnings ($) 225 500 750

C

Days. 6 12 20

Earnings ($) 225 450 675

D

Days. 6 12 20

Earnings ($) 225 450 750