Skater X of mass 60kg and skater Y of mass 30kg stand in contact on smooth ice. They suddenly push apart. Which statement correctly compares their accelerations during the brief push?
a) Both skaters accelerate equally in opposite directions.
b) Skater X accelerates twice as much as skater Y.
c) Skater Y accelerates twice as much as skater X.
d) Skater Y accelerates four times as much as skater X.