There are various factors and conditions responsible for having different types of rural settlements in India. 

These include: 

(i) physical features – nature of terrain, altitude, climate and availability of water

(ii) cultural and ethnic factors – social structure, caste and religion 

(iii) security factors – defense against thefts and robberies.

Sex ratio is a demographic factor and doesn't directly determine the location of rural settlements. Therefore, option 4 does not affect the location of rural settlements.