By far the most abundant element in the giant (Jovian) planets is:

• A. Hydrogen (H)
• B. Carbon (C)
• C. Nitrogen (N)
• D. Oxygen (O)

Answer: (A)

Verified step by step guidance

1. Understand that Jovian planets, also known as gas giants, are primarily composed of gases rather than solid materials.
2. Recall that the most abundant element in the universe and in gas giant planets is hydrogen, due to its light weight and abundance after the Big Bang.
3. Recognize that elements like carbon, nitrogen, and oxygen are present but in much smaller amounts compared to hydrogen in these planets.
4. Note that hydrogen exists mostly in molecular form (H\_2) in the atmospheres of Jovian planets such as Jupiter and Saturn.
5. Conclude that hydrogen is the most abundant element in Jovian planets based on their composition and the nature of gas giants.