The playwright uses Reggie’s dialogue to highlight that—

Responses
A he does not know he should not joke around with his friendshe does not know he should not joke around with his friends
B he tries so hard to have a normal conversation that he succeedshe tries so hard to have a normal conversation that he succeeds
C he tells Tim what not to do and what not to say to Markhe tells Tim what not to do and what not to say to Mark
D he feels uncomfortable talking normally to his friend in a wheelchair

D he feels uncomfortable talking normally to his friend in a wheelchair