Assertion : For angular projection, when angle of projection $\theta=\tan ^{-1}(1)$, the horizontal range is four times the maximum height. Reason : The horizontal range of projectile is directly proportional to square of velocity and inversely proportional to acceleration due to gravity.

• A

  If both assertion and reason are true and reason is the correct explanation of assertion.
• Correct answer
  B

  If both assertion and reason are true but reason is not the correct explanation of assertion.
• C

  If assertion is true but reason is false.
• D

  If both assertion and reason are false.

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