+) From the 1. clue, we know that Josie brought carrot.
    And from the 3. clue we know that Katy didn't brought sweetcorn and nor carrot so she brought apples.
    So we're left with Dillion who brought sweetcorn.
+) From the 2. clue, we know Dillion love sitting with his friends.
    And from the 4. clue, the one who didn't brought carrots love helping others, and we know that Dillion & Katy didn't brought carrot, but dillion        love sitting with his friends so Katy would be the one who love helping others.
    That's mean we're left with Josie who love singing.