The correct option is
B Jupiter
The following is the estimated radii of the eight planets in our solar system, in order of size.
Jupiter (69,911km/43,441miles) 1,120% the size of Earth
Saturn (58,232km/36,184miles) 945% the size of Earth
Uranus (25,362km/15,759miles) 400% the size of Earth
Neptune (24,622km/15,299miles) 388% the size of Earth
Earth (6,371km/3,959miles)
Venus (6,052km/3,761miles) 95% the size of Earth
Mars (3,390km/2,460miles) 53% the size of Earth
Mercury (2,440km/1,516miles) 38% the size of Earth
So, the correct order for the given planets of solar system on the basis of their size is Jupiter, Saturn, Neptune, Mercury.