According to studies, which form of evidence is the most incriminating one (likely to lead to a conviction)?

The answer is "confession".

Explanation:

The confession is a declaration, which is made by someone or a group of people that the individual or group obviously would much rather keep protected.  

answer; i do believe its (b) 12.5 years of age;

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.