I NEED HELP ASAP
Grandma bakes the world's best and favorite cookies. Grandma's cookies have a half-life of 2 hours. One day, Grandma baked a lot of cookies. If 2 days and 6 hours later, 2 cookies still remain, how many cookies did Grandma make?
A) 3.6 × 10^16
B) 4 dozen cookies
C) 268,435,456 cookies
D) 153 cookies