Option C is the correct answer.
Explanation:
Height of Mount Everest = 8.8 x 10³ m = 8800 m
Height of the Empire State Building = 3.8 x 10² m = 380 m

Height of Mount Everest = 23 x Height of the Empire State Building.
So, Mount Everest is about 23 times as tall as the Empire State Building
Option C is the correct answer.