单选题：根据以下内容回答题：About 50 years ago the idea of disabled people do

根据以下内容回答题：
About 50 years ago the idea of disabled people doing sports was never heard of．But when the annual games for the disabled were started at Stroke Mandeville，England in l948 by Sir Ludwig Guttmann，the situation began to change．Sir Ludwig Guttmann．who had been driven to England in l939 from Nazi Germany，had been asked by the British government to set up an injuries centre at Stroke Mandeville Hospital near London．His ideas about treating injuries included sports for the disabled．
In the first games just two teams of injured soldiers took part．The next year，1949，five teams took part．From those beginnings things developed fast．Teams now come from abroad to Stroke Mandeville every year．In l960 the first Olympics for the Disabled were held in Rome．Now．every four years the Olympic Games for the Disabled are held，if possible，in the salTlte place as the normal Olympic Games，aJthough they are organized separately．In other years Games for the Disabled are still held at Stroke Mandeville．In the l984 wheelchair Olympic Games，1，604 wheelchair athletes from about 40 countries took part．Unfortunately，they were held at Stroke Mandeville and not in Los Angeles，along with the other Olympics．
The Games have been a great success in promoting international friendship and understanding，and in proving that being disabled does not mean you can’t enjoy sports．One small source of dis-appointment for those who organize and take part in the games，however，has been the unwilHng-ness of the International Olympic Committee to include the disabled events at the Olympic Games for the able bodies．Perhaps a few more years are still needed to convince those fortunate enough not to be disabled that their disabled fellow athletes should not be excluded．
The first games for the disabled were held__________after Sir Ludwing Guttmann arrived in England． A．50 years
B．21 years
C．9 years
D．4 years