The Sahara is a desert located in northern Africa (as you can see in the map). And one of the only answer countries in proximity to that desert is Mali, so the answer would be C.
The answer is Lincoln Nebraska
Well if you were/are an introvert you will consider yourself quite timid most time focusing on inner thoughts and ideas, rather than what's happening externally. you also would rather hang around yourself or with one or two people and would consider yourself different as you dont want to be popular and known well.
The systematic study of human population is called, demography.