Final answer:
The correct option is (D) which states that the process of atom creation, termed Big Bang nucleosynthesis, produced all known natural elements according to the Big Bang theory.
Step-by-step explanation:
The Big Bang theory proposes that the universe began in a state of high temperature and density and has been expanding ever since. Following this premise, the correct answer to your question is (D) the process of atom creation, termed Big Bang nucleosynthesis, produced all known natural elements.
According to current cosmological models, the universe began with the Big Bang approximately 13.7 billion years ago. The early universe was very hot and dense and as it expanded and cooled, the formation of atoms and eventually the molecules necessary for the creation of stars and galaxies began taking place. This is a process known as Big Bang nucleosynthesis.
It should be noted that option B is incorrect because atoms formed when the universe cooled down, not while it was at a temperature above 1 billion degrees. Option A represents star formation within existing galaxies, not the initial creation of the universe, and option C relates to the formation of our solar system, which is a separate process occurring much later.