Go for options 1 and option 3
Since the spinner is divided into 3 sections and there are four different colours, each child can then choose different colours.
Also, a standard deck of card has 4 suits which are: clubs, diamonds, hearts and spades.
Using two coins will yield only 2 winners because the possible outcome is either head or tail, so 2 of Paul's children will have to choose Head and the other 2 will select Tail. So this method is not effective