42.
Your Answer is
Correct Answer is G
Explanation
According to the sentence meaning "Naismith developed 13 rules to encourage competition and reward physical ability and technical strategy", so encouragement and reward are juxtaposed, and the parallel structure format: to do and (to) do, item G is correct.
F/H item: Both have repeated information the rules.
Item J: It is not a complete sentence after the period, wrong.