Grace is considering whether to invest at age 40 $1,000 that earns 6% each year, or to invest at age 50 $2,000 that also earns 6% each year. Grace would have more money at age 60 if she invests at age _______, because of OA) 50; compounding OB) 50; the dollar amount invested OC) 40; the dollar amount invested OD) 40; compounding