10 m
15 m
20 m
40 m
Answer is Wrong!
Answer is Right!
The correct answer is: C. 20 m.
Construction joints are provided in buildings to allow for movement of the structure due to changes in temperature, humidity, and other factors. They are typically located at regular intervals, such as every 20 m. This helps to prevent cracks from forming in the structure.
Option A is incorrect because 10 m is too short of a distance to provide adequate movement for the structure. Option B is incorrect because 15 m is also too short of a distance. Option D is incorrect because 40 m is too long of a distance.