Factory Emissions is going in the wrong direction. The arrow should be pointing upward, as factory emissions release carbon into the atmosphere.
C.tt is the correct answer
It would be d. in your conclusion you want to state if your hypothesis was right or wrong and why.
Diversity is produced by mutation, it is what causes life to have advantages or disadvantages, and thus allow survival of the fittest to choose which mutation is the best suited for it's environment.