The word hemisphere is made up of two parts, hemi and sphere. what does the prefix hemi mean?

Hemisphere originates from the Greek, and consolidates the prefix hemi-, which means "half" with sphere, or "completely round ball." Hemi-is the prefix, signifying "half of a sphere”.  

Prefixes and suffixes are etymological components that are not autonomous words but rather that change the word root's significance. Prefixes are word parts that show up at the beginning of the word or base. Not every term have prefixes; but rather when introduce, prefixes make the significance more particular.

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.

the answer is:

c. economic output