Assertion : A glass ball dropped on concrete floor can easily get broken compared if it is dropped on wooden floor. Reason : On concrete floor glass ball will take less time to come to rest.

• Correct answer
  A

  If both assertion and reason are true and reason is the correct explanation of assertion.
• 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: 'A'.