Your Class Is Rather Unhappy with the Instructor, and They

Multiple Choice

Your class is rather unhappy with the instructor, and they pitch in and decide to fund a sabbatical for him to go to Mars. Unbeknownst to the students the following semester, the instructor has made long distance course arrangements so the "show can go on". The instructor begins talking about mass, weight and related things. He correctly makes which following statement:

A) his mass is still essentially unchanged but his weight is less than on earth.
B) his weight is still essentially unchanged but his mass is less than on earth.
C) neither his weight nor his mass have changed much.
D) his weight and mass have both changed significantly.