I think it’s b but I could be wrong
Answer:
Some reason of decrease in the population in the second and the third census are listed below, First World War. Recruitment of Nepalese Youth to Gurkha Army. Unscientific and unsystematic methods of counting population.
Ummm. It's simply not a question l. "How not to be lonely." Is a statement. Like, this is how not to be lonely.... if it were to be a question then you would say, "How do you not be so lonely?"