Most children successfully acquire conservation skills during the stage of cognitive development.\

The answer is, during the:

concrete operational stage of cognitive development

Quick information:

This concrete operational stage of cognitive development is the third stage of Piaget's theory of cognitive development. It is considered as a major turning point in the child's cognitive development. And, children on this stage is able to incorporate inductive logic.

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.

i have to go with a for this one