Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Houses made of concrete roofs overlaid with foam keep the room hotter during summer. Reason R: The layer of foam insulation prohibits heat transfer, as it contains air pockets. In the light of the above statements, choose the correct answer from the options given below.

• A

  $A$ is true but $R$ is false.
• Correct answer
  B

  A is false but $R$ is true.
• C

  Both A and R are true and R is the correct explanation of A .
• D

  Both $A$ and $R$ true but $R$ is NOT the correct explanation of $A$.

Hence, the correct answer is option: 'B'.