Read Assertion (A) and Reason (R) carefully :

Assertion (A) : Mixture of cow dung and mud is used to coat the floor of houses.

Reason (R) : Cow dung helps to regulate the temperature inside the house and keeps the insects away.

Choose the correct option.

To determine the correct option, let us analyze the Assertion (A) and the Reason (R) step-by-step:

1. Analysis of Assertion (A):
Assertion (A) states: "Mixture of cow dung and mud is used to coat the floor of houses."
In rural and traditional housing, particularly in India, it is a very common practice to plaster or coat the mud walls and floors with a mixture of mud and cow dung. Therefore, Assertion (A) is true.

2. Analysis of Reason (R):
Reason (R) states: "Cow dung helps to regulate the temperature inside the house and keeps the insects away."
A coating of mud and cow dung acts as a natural insulator, keeping the interiors of the house warmer in winter and cooler in summer. Additionally, cow dung has natural insect-repelling properties that prevent pests and insects from entering or breeding on the floor. Therefore, Reason (R) is true.

3. Evaluating the Connection:
The reason why people coat their floors and walls with this mixture (as stated in Assertion A) is precisely because it helps regulate temperature and keeps insects away (as stated in Reason R). Thus, R is the correct explanation for A.

Therefore, both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).