stays the same no matter what location you are in.

the date is the only thing that's the same everywhere you go because time is different

correct it is c.) b b

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.