Answer:
Jupiter
Explanation
The gravitational pull is determined by the mass of the celestial body. It follows that the gravitational force increases with the mass of the object.
For a satellite with mass m that orbits at 100 km above the surface, the gravitational force can be calculated using the formula below:

The variables are defined as follows:
G = universal gravitational constant
m = mass of the satellite
M = mass of the celestial body exerting the pull on the satellite
r = distance from the satellite to the celestial body
The gravitational force reaches its peak when M is maximized.
Since Jupiter is the largest planet and possesses the greatest mass, it will exert the strongest gravitational influence on a satellite positioned 100 km above its surface.