The indus and huang he (yellow)river are both closely associated with

The correct answer is Option 3) Cradles of early civilization.

Both the Indus river and the Yellow River gave rise to two of the world's greatest civilizations.

Indus River which runs through modern-day Pakistan gave rise to Harrapa and Mohenjodero civilizations that today result in the population clusters we see in India, Pakistan and Bangaldesh.

Yellow River, gave rise to the ancient Chinese Civilization and it still holds an important place in the country's traditions.

the answer is option a.

a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.