As an object increases in altitude, its mass: decreases
or remains the same

Remains same

Explanation:

Mass of an object is measure of the matter it contains. It is independent of height. Commonly when we weigh something we measure its weight and not mass. Weight is a product of mass (m) and acceleration due to gravity (g).

As altitude changes, the amount of matter doesn't change thus the mass will remain constant. But due to the change in height the gravitational force will change and thus weight will vary.

i believe it is b. what was the cause of the big bang

hope this !

iron would move it is magnetic there is a mag field around the current in the wire