Which activity is an effective solution for keeping the oxygen cycle stable A. Replanting trees in deforested areas B. Dumping waste from ships into the ocean C. Pruning trees in the backyards of home?

A. Replanting trees in deforested areas is an effective solution for keeping the oxygen cycle stable. Trees play a crucial role in photosynthesis, absorbing carbon dioxide and releasing oxygen, which is essential for maintaining a balanced ecosystem. In contrast, dumping waste into the ocean or pruning trees does not significantly contribute to stabilizing the oxygen cycle.