Which planet in our solar system has the least surface gravity?

Pluto has the least surface gravity of any planet in our solar system due to its small size and mass. Surface gravity is determined by the mass of the body and its radius; smaller celestial bodies with less mass exert weaker gravitational forces. Pluto's mass is much less than that of the major planets, and while it has a modest radius, its overall gravitational pull is not sufficient to keep objects anchored with as much force as those on larger bodies like Earth or Jupiter. Therefore, among the given choices, it is correct to identify Pluto as the one with the least surface gravity.

In general, when comparing surface gravities, larger and more massive planets like Jupiter exert much stronger gravitational forces, while Earth and Mars have moderate surface gravities that are significantly greater than that of Pluto.