Car manufacturers have begun to explore the use
of biofuels, such as biodiesel, ethanol, and cooking
oils made from plant material. the desired
outcome of using these biofuels would be
(1) a decrease in the use of fossil fuels
(2) a decrease in the release of oxygen gas
(3) an increase in abiotic resources
(4) an increase in global warming

Option no. 2 a decrease in the release of oxygen gas

It is not simple because the process of growing crops, it needs more fertilizers, and processing the plants converting it to fuels needs a lot of energy. As much energy is used during the production from natural gas. The way of making biofuels it contains cellulose. Cellulose                          
                                                                                                      

Ibelieve the answer is relative humidity  because it makes more sense that way. solar flares usually occur in space it doesn't affect the earth, well it could but it wont make a significant damage.  latitude is land it doesnt do anything. prevailing winds, i dont know the correct meaning for this but i doubt that affects the land so it has to be relative humidity.

A.true this might be wrong, but if it's not wrong, mark me brainliest.