Round the Following Number to Four Significant Figures and Express

Multiple Choice

Round the following number to four significant figures and express the result in standard exponential notation:
29,724.33

A) 29,720
B) 29.72 × 10³
C) 0.2972 × 10⁵
D) 2.972 × 10⁴
E) 2.972 × 10^-4