A、] I know for sure that quite few youngsters nowadays have the habit of listening to background music while doing their homework. [
B、] I know for sure that quite a few youngsters nowadays have the habit of listening to background music while doing their homework. [
C、] I know for sure that quite a few youngsters nowadays have the habit of listening to background music doing their homework. [
D、] I know for sure that quite a little youngsters nowadays have the habit to listening to background music while doing their homework.