Gas giants true statement?

• A. They are rocky planets near the Sun
• B. They mostly consist of hydrogen and helium
• C. They have solid surfaces
• D. They orbit very close to the Sun

Answer: (B)

Gas giants are planets whose mass is dominated by gaseous envelopes rather than solid rock. The defining feature is that their atmospheres are mostly hydrogen and helium, which is why the best statement describes them as primarily made of these two light elements. This composition gives them very thick, deep atmospheres and strong gravity that can hold onto these gases, rather than a solid surface like rocky planets have. They do not have solid surfaces accessible to standing on, and they are located far from the Sun in the outer solar system, not close to it. So, the hydrogen-and-helium dominance best captures what a gas giant is.