The fusion of which element in stars has resulted in the creation of all other heavier elements through nucleosynthesis?

• A. Oxygen
• B. Carbon
• C. Hydrogen
• D. Helium

Answer: (C)

Verified step by step guidance

1. Understand that nucleosynthesis in stars refers to the process by which new atomic nuclei are created from pre-existing nucleons (protons and neutrons).
2. Recognize that the fusion of lighter elements into heavier elements occurs in stars through a series of nuclear reactions.
3. Identify that the fusion process starts with the simplest and most abundant element in the universe, which is hydrogen.
4. Know that hydrogen nuclei (protons) fuse together in stars to form helium, and through subsequent fusion reactions, heavier elements like carbon, oxygen, and beyond are formed.
5. Conclude that hydrogen fusion is the fundamental starting point for the creation of all heavier elements in stars via nucleosynthesis.