Which of the following is a characteristic of jovian planets?

Jovian planets, also known as gas giants, are characterized by their large size and composition primarily made of gases such as hydrogen and helium. Unlike terrestrial planets, which have solid and rocky surfaces, jovian planets lack a well-defined solid surface and are mostly composed of gas surrounding a possible small core. This expansive atmosphere contributes to their massive size compared to the terrestrial planets.

Focusing on the characteristics of jovian planets, they are significantly larger in diameter than terrestrial planets, which allows them to have a higher volume and mass. The primary gaseous composition not only affects their physical structure but also their atmospheric dynamics, leading to phenomena such as strong winds and storms. Therefore, this characteristic of being larger and primarily gaseous is definitive for jovian planets and explains why this option is the correct answer.