The correct options are
B Political and religious parties can work together to promote unity among citizens.
C The government can take strict actions against communal elements in society.
D Youth should promote a secular and scientific attitude.
Communalism is a hindrance to the progress of society and the nation. It is essential to take different steps to control communalism. Political parties based on communal ideas should not be encouraged. To promote unity among citizens, political and religious parties can work together. The government can take strict actions against communal elements in society and the youth should promote a secular and scientific attitude.