Final answer:
The diameter of Earth is 12.7Mm, which equals 1.27×109 cm when converted to centimeters. This corresponds to answer choice C).
Step-by-step explanation:
Converting the diameter of Earth from megameters (Mm) to centimeters involves multiplying by the number of meters in a megameter and then by the number of centimeters in a meter. There are 1,000,000 meters in a megameter and 100 centimeters in a meter. So, the conversion is as follows:
12.7Mm = 12.7 × 1,000,000m = 12,700,000m
Now convert meters to centimeters:
12,700,000m × 100cm/m = 1,270,000,000cm
Therefore, the diameter of Earth in centimeters is 1.27×109 cm, which corresponds to answer choice C).