The correct answer is option (C), Chamba.
The sex ratio of Scheduled Tribes (STs) in Chamba district is 877 females per 1000 males, which is the lowest among all the districts of Himachal Pradesh. The sex ratio of STs in Hamirpur district is 901 females per 1000 males, the sex ratio of STs in Sirmaur district is 912 females per 1000 males, and the sex ratio of STs in Kangra district is 923 females per 1000 males.
There are a number of factors that contribute to the low sex ratio of STs in Chamba district. One factor is that the district has a high rate of female infanticide. Another factor is that the district has a high rate of migration of young men, which leaves behind a large number of unmarried women. Finally, the district has a high rate of poverty, which can lead to families having fewer children, including girls.
The low sex ratio of STs in Chamba district is a serious problem. It has a number of negative consequences, including a shortage of women of marriageable age, a lack of female role models, and an increase in crime against women. The government of Himachal Pradesh has taken a number of measures to address the problem, including providing financial incentives to families who have daughters, and launching awareness campaigns about the importance of girls’ education. However, more needs to be done to address this issue.