I think it's A) Sunspots. I hope this helps:)
Presently, the speed of light in a vacuum is defined to be exactly 299,792,458 m/s (approximately 186,282 miles per second). . An early experiment to measure the speed of light was conducted by Ole Romer, a Danish physicist, in 1676. Using a telescope, Ole observed the motions of Jupiter and one of its moons, Io
this is basically the same as volume, no?
So, 5.345*4.128*3.859=85.145