Q:

Assertion
 (A): I came late today.
 Reason
 (R): It was raining.

• 1
  If A is true but R is false.
• 2
  If A is false but R is true.
• 3
  If both A and R are true and R is the correct explanation of A.
• 4
  If both A and R are true and R is not the correct explanation of A.