What Evidence Exists to Show That African Preagricultural Settlements Were

What evidence exists to show that African preagricultural settlements were reliant on water resources for food?

A) harpoons in the archaeological record and sites along the shores of rivers and lakes
B) mortars and pestles in the archaeological record and remains of pit houses
C) projectile points in the archaeological record and evidence of temporary shelters
D) wooden spears in the archaeological record and sites in rock shelters and caves