I would say C. Reduce climate change because taking a car/vehicle results in the earth becoming polluted which leads to climate change.
*EXPLANATION*
Riding your bike or walking will not do anything to help people chopping down trees, people giving birth to more and more children nor will increase the amount of animals/organisms we have on our planet.
Plasmids are small DNA fragments that occur in many bacterial cells.
Enzymes (Catalysts) lower the required activation energy, allowing the reaction to happen more quickly.
