Which of the following is not a reason why india has a larger male population than female population

Latvia ("Latvija" in the Latvian language). The ratio is -Female : male =2 : 1. The reason to this situation is the last century. Our bigger neighboring country's used Lativa as their war zone and forced our men to participate in it (used them mainly in the front lines). On top of that the Soviet Union used different means to kill us off, like a one way death trip to Sibiria. They got rid of them in 1991. Since then, they still stalk them, so the system is messed up. Somehow, the men get easily depressed by this and their low-payed jobs (they force themselves to have high expectations) so, to escape reality, they often turn to drinking and suicide. When they were in school, there was always more females then males in all classes (ratio = 2x more females). Men also have a shorter life span by ~ 10 years than females.

What are the options?