Which of the following examples of speech would be restricted

The right answer for the question that is being asked and shown above is that: "B. Using an obscenity to make a pertinent political point "

These are the following choices:
A. Going door-to-door urging strangers to join your religious group 
B. Using an obscenity to make a pertinent political point 
C. Stating that your religious values have impelled you to take a particular political position 
D. Using an obscenity as part of a personal argument