B. Young Isaac was fond of ... 1) jumping into games. 2) reading historical books. 3) studying the nature.

3) studying the nature. Объяснение: В тексте указано: "...young Isaac preferred to spend his time exploring the wonders of nature and experimenting with colors and light." (...молодой Исаак предпочитал проводить время, исследуя чудеса природы и экспериментируя с цветами и светом.)