The two balls arrive at the floor with a gap between them of $1$ mm or less after falling nearly $1$ meter. What does this tell us about the acceleration of objects of different mass in the presence of a much larger object just as a planet?

a$.$ That the relative accelerations are the same to within about $1\%.$

b$.$ That the relative accelerations are proportional to their masses.

c$.$ That the relative accelerations are not the same.

d$.$ That the relative accelerations are the same to within about $0\mathrm{.}1\%.$