The Earth's circumference at the equator is approximately 40,075 kilometers. How many cm are there in the Earth's equatorial circumference?

• A. 4.0075 × 10⁹ cm
• B. 4.0075 × 10⁴ cm
• C. 4.0075 × 10¹⁵ cm
• D. 4.0075 × 10⁶ cm

Answer: (A)