A consumer really wants tickets to a concert, but because the concert is so popular, ticket prices are very high. Which factor best describes this effect on demand?

A. the number of consumers in the market
B. the availability of labor and materials
C. a change in price of a substitute good
D. a change in price of a complementary good
Plz help

What recommendations would you give to your local community to to decrease the local effects of human impact on the environment? list 2 recommendations and how they will positively impact your community. 3. what recommendations would you give to the global governments to decrease the global effects of human impact on the environment? list 2 recommendations and how they will positively impact our planet.