Final answer:
The diameter of the sun is 2.8 x 10^2 times larger than the diameter of Mercury.
Step-by-step explanation:
To find out how many times larger the diameter of the sun is compared to the diameter of Mercury, we divide the diameter of the sun by the diameter of Mercury.
Calculating this, we get: (1.39 x 10^6 km) / (4.88 x 10^3 km) = 2.8 x 10^2 times larger.
Therefore, the correct answer is c. 2.8 x 10^2 times larger.