If Amisha works hard, then either Santosh or Ravi will enjoy themselves. If Santosh enjoys himself, then Amisha will not work hard. If Devika enjoys herself, then Ravi will not enjoy himself. Therefore, if Amisha works hard then which of the following statements follows ?

Statement 1: If Amisha works hard, then either Santosh or Ravi will enjoy themselves
Statement 2: If Santosh enjoys himself, then Amisha will not work hard
Statement 3: If Devika enjoys herself, then Ravi will not enjoy himself

We are then told that, Amisha works hard and then asked to choose one of the options. 
We are told that if Santosh enjoys himself, Amisha wont work hard, so that means Santosh cannot enjoy himself and Ravi will have to Enjoy.