Which early river valley civilizations are marked with the letters a and b on this map?
choose the two correct answers.
a is china
a is egypt
a is indus valley
a is mesopotamia
b is china
b is egypt
b is indus valley
b is mesopotamia

A is Egypt  and  B is Mesopotamia

Explanation:

Along with ancient Egypt and Mesopotamia it was one of three early civilizations of the region comprising North Africa, West Asia and South Asia, and of the three, the most widespread, its sites spanning an area stretching from northeast Afghanistan, through much of Pakistan, and into western and northwestern India.

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