To provide clean running water, Philadelphia 1:purchased clean water from other major cities
2:controlled the flow of its streams with underground pipes
3:built a water factory where people brought wastewater for cleaning
4: urged its residents to mix salt with water to destroy bacteria before drinking
PLS ANSWER FAST, WILL GIVE BRAINLIEST TO BEST ANSWER

It is number 2: controlled the flow of its streams with underground pipes

the hyksos invasion. the hyksos were able to attack egypt successfully because of their skills in using bronze weapons, composite bows and the use of the horse and chariot during the invasion. although the egyptians depict a barbarian-type overthrow, the truth is the seizure was likely a relatively peaceful one.