For Reasons Known Only to Them, a Group of Extraterrestrials

For reasons known only to them, a group of extraterrestrials offers you your choice of three gold ingots. One weighs 10 lb on Earth, the second weighs 10 lb on Jupiter, and the third weighs 10 lb on the Moon. To get the most gold, you should choose the ingot that weighs 10 lb on

A) Earth.
B) Jupiter.
C) the Moon.
D) No difference; 10 lbs is 10 lbs wherever you go.