The number of cells growing in a particular Petri dish doubles every 30 minutes. If at 8:00 am there were 60 cells in the dish how many were there at noon of the same day?
(A)\(60 \times 2^ { -8 } \) (B)\(60 \times 2^ { -4 } \) (C)\(60 \times 2^4\) (D)\(60 \times 4^4\) (E)\(60 \times 4^8\)
D