How much does Jimmy earn each week, and
 how much does he save by week 4?
 A. Jimmy earns $3 each week, and he has $12 by
 week 4.
 B. Jimmy earns $3 each week, and he has $10 by
 week 4.
 C. Jimmy earns $6 each week, and he has $12 by
 week 4.
 D. Jimmy earns $6 each week, and he has $10 by
 week 4.