Idon't really get this can someone explain

Which indo european tribe developed a strong warrior society and built an empire that was frequently invaded by those seeking fertile land

What explains the increase in life expectancy in botswana? a. the increased availability of jobs and an improved economy b. access to antiretroviral drugs, hiv/aids education, and widespread hiv/aids testing c. a series of military takeovers that stabilized the political system and led to education reform and increased literacy rates d. a recent military coup that led to an improved healthcare system select the best answer from the choices provided.

World war 2 was caused, in part, by which of these factors?