Which of the Following Is Correctly Written in Scientific Notation

Which of the following is correctly written in scientific notation?

A) 50.0 × 10⁶
B) 4.02 × 10²¹⁶
C) 1 × 10 ^{− 6.8}
D) 1.005 × 10 ^{− 9.05}
E) 10 ^{− 5}