Determine which pair of rates are equivalent.

A. $2.00 for 5 cookies; $6.00 for 20 cookies

B. $2.00 for 5 cookies; $8.00 for 10 cookies

C. $2.00 for 5 cookies; $6.00 for 10 cookies

D. $2.00 for 5 cookies; $8.00 for 20 cookies