【英语】It was in Atlanta ______ nearly half the population were……
It was in Atlanta ______ nearly half the population were black ______ one of the great leaders of the Civil Rights Movement,Dr.Martin Luther King,Jr.was born.
A.that；that
B.that；where
C.where；that
D.where；where
帮我详细讲解一下这题为什么选“C”不选“B”?这些从句什么的我都不太懂.