What Is the Correct Answer to the Expression Below

Multiple Choice

What is the correct answer to the expression below?
1.472 × 10−⁷ + 4.32 × 10−⁹ =

A) 2 × 10−⁷
B) 1.5 × 10−⁷
C) 1.52 × 10−⁷
D) 1.515 × 10−⁷
E) 1.5152 × 10−⁷