The correct answer to your question is A, Britain.
When Gandhi was born, Britain had India under it's palm. Before, India resorted to violence I believe two times to get the British out, but he took the peaceful route. Much like Martin Luther King Jr.
Is there certain options or can I use whatever word?
A. because dialogur is more then two people talking and without the lines they wouldn't know what to say.
A i believe is the answer