According to Professor Martin, which children suffer most from changing schools constantly

A．it was time we gave up our prejudice on the present educational system
B．the report didn’t show enough evidence to prove his former idea
C．his findings were based on the evidence rather than on his own feeling
D．he had an experience of moving around the country with his parents

A．his children were not affected by changing schools
B．Army schools usually provide better education than other schools
C．Army children are better adjusted than any others
D．it's harmful to have children living with their parents all the time