Answered

how have humans offset the balance of the carbon cycle

(EXPLAIN HOW YOU GOT THAT LETTER CHOICE)

ACutting trees which increase the amount of carbon available for food/
BCutting trees which will increase carbon dioxide in the atmosphere.
CCutting trees which reduces available oxygen for humans.
DCutting trees which will reduce water in the atmosphere.

Verified Answer :

The correct answer is C. Trees provide oxygen for humans, so by reducing trees you reduce oxygen available for humans.