Which planet has a day lasting about 10.7 hours?

Jupiter is the correct answer because it has a very short rotation period, leading to a day that lasts approximately 10.7 hours. This rapid rotation is a characteristic feature of gas giants like Jupiter, which allows them to have a pronounced equatorial bulge and influences their weather systems, contributing to the presence of the Great Red Spot and other dynamic atmospheric phenomena.

In contrast, planets like Earth and Mars have longer days, with Earth taking about 24 hours and Mars about 24.6 hours to complete a rotation. Saturn, while also a gas giant, has a day length of about 10.7 hours, but it is slightly longer than that of Jupiter. Thus, the unique rotational speed of Jupiter distinctly sets it apart in this context as having the shortest day among the options provided.