A common element among all the river valley civilizations was: A) irrigation systems that moved water to crops and settlements

B) developed written materials

C) developed plumbing systems

D) the worship of leaders as gods

read the passage and u will find your answer

Explanation:

in this scenario it would be the consumer demand as most influential in making the decision. the band members need to figure out where and from whom they will make the most money, in other words who out of the two consumer groups - football fans or car drivers - will spend their money, who is more likely to contribute to their cause and buy what they are offering.