Scholars believe the migration of homo sapiens into central and western europe occurred along the around 35,000 years ago.
a. pyrenees mountains between modern france and spain.
b. baltic sea coast.
c. danube river valley.
d. english channel coast.

c. Danube River Valley.

Explanation:

According to my research on various historical studies, I can say that based on the information provided within the question scholars believe the migration of Homo sapiens into central and western Europe occurred along the Danube River Valley around 35,000 years ago. This is a river valley that enters Lower Austria from the west near Ybbs and exits in the east near Bratislava, Slovakia's capital

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c. pro-democracy demonstrations.

climate change is the big reason to the decline of the indus valley which also caused floods. so i dont know what answer would best fit the description thats just what i found online! have an awesome