Compared to terrestrial planets, the Jovian planets are

(C) Larger in size and have lower densities


Jovian planets often known as gas giant are not primarily composed of rock and solid matter but gas, hence they have larger size but lower densities. There are four Jovian planets known in our solar system: Jupiter, Saturn, Uranus and Neptune.
Alternative explanation: Jovian planets include Jupiter — a ‘gas giant’ ==> bigger and less dense.

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