Farmers like to grow crops in alluvial plains because . A.
alluvial plains have fewer rodents and other animals that eat crops
B.
alluvial plains’ steep hills drain off unwanted water
C.
alluvial plains get more sunshine than other areas
D.
alluvial plains contain rich, fertile soil deposited by a river or rivers

Alluvial plains contain rich, fertile soil deposited by a river or rivers, in short it’s D

The  pan-african movement  was an "emotional, cultural, psychological and ideological  movement  that began among the  african  dispora in the western hemisphere, for a closer  purpose, so that  african  people could feel secure, attain political, economic as well as psychological power visa vis other races or world regions" .

The answer is b.african american abolitionists emphasized legal and social equality