To provide clean running water, Philadelphia A. purchased clean water from other major cities
B. controlled the flow of its streams with underground pipes
C. built a water factory where people brought wastewater for cleaning
D. urged its residents to mix salt with water to destroy bacteria before drinking
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b or c

Explanation: makes the most since

wood carving remains today the primary sculptural art form of the sub saharan continent. african art history shows the earliest wooden sculptures from the 17th c are attributed to the kuba, central zaire but the earliest surviving sub-saharan sculpture is a zoomorphic head found in 1928 in central angola.

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d: social contract theory