Which law does this diagram illustrate?
missing metadata

a.
elliptical paths, such as those followed by planets around the sun, take longer when the smaller object (the planet) is closer to the larger object (the sun) due to the universal force of gravity.

b.
as planets orbit the sun, they follow an elliptical path with the sun as one focus. the path takes a greater amount of time closer to the sun than farther away from it.

c.
the space-time warp causes the grid areas at each of the two foci to be of unequal size when the planet travels its elliptical path.

d.
as planets orbit the sun, they follow an elliptical path with two foci. an equal area is swept out in an equal amount of time by the planet at both foci.