Answer:
The correct answer is: i, ii, and iii only.
Step-by-step explanation:
i. The cosmic microwave background radiation: One of the strongest pieces of evidence for the Big Bang theory is the detection of cosmic microwave background radiation (CMB). The CMB is a faint glow of radiation that permeates the universe and is considered a remnant from the early stages of the universe, when it was much hotter and denser.
ii. The redshift of most galaxies: Observations of the redshift of light from distant galaxies provide evidence for the expansion of the universe. The redshift indicates that galaxies are moving away from us, and this consistent expansion supports the idea of an initial explosion or Big Bang.
iii. The high amounts of hydrogen and helium in the universe: The abundance of hydrogen and helium in the universe is consistent with predictions made by the Big Bang theory. According to the theory, in the early stages of the universe, only light elements like hydrogen and helium were formed, and later, through stellar nucleosynthesis, heavier elements were synthesized.
iv. The oldest stars are the furthest from us: This statement is not directly related to the Big Bang theory. The distance of stars from us does not necessarily indicate their age. The age of stars can be determined through various methods, such as stellar evolution models and observations of their characteristics.
Therefore, the correct choice is i, ii, and iii only.