Answer:

C. Jupiter

Explanation:

Because it’s large enough that its moons don’t exert a significant tidal drag on Jupiter.

At the beginning of the Solar System, Venus, Mercury, and Earth rotated quite rapidly. But, over the course of billions of years, tidal locking slowed the rotation of all three. Jupiter, by contrast, has moons that are small relative to its size, so the force of tidal locking relative to its angular momentum was quite small.

To see the difference, consider the effect of tides on the Earth.

When the Earth formed 4.5 billion years ago, its day was only 4 hours long, substantially shorter than Jupiter’s day of just a little under 10 hours. But just 60 million years later, a Mars-sized body named Theia hit the Earth, ripping off its crust. The fragments grouped into the Moon, which formed at just outside the Earth’s Roche Limit, just 20,000 km above the Earth’s surface. The Moon at that time would have seemed enormous, stretching across 1/5 of the night sky, about 20 times as big as it is today.

And the tides would have been tremendous — about 8000 times the size of the tidal force on Earth today. Of course, the Earth exerts an enormous tide on the Moon as well, and the phenomenon of tidal locking acted to slow the rotation of both bodies and move the Moon to its current location, 384,000 km from Earth.