The correct answer is B. They release harmful greenhouse gases into the atmosphere.
Step-by-step explanation:
Exhaust fumes from cars are composed of different gases such as nitrogen, water vapor, nitrous oxide, methane, and carbon dioxide that go to the atmosphere after being released and contribute to the greenhouse effect. Indeed, gases such as carbon dioxide, water vapor, and nitrous oxide are considered greenhouse gases, this means these gases trap part of the radiation from Sun and stop this from being released, which increases the temperature on Earth; this causes higher than normal temperatures and has multiple effects on natural environments. Thus, exhaust fumes from cars affect the environment because "They release harmful greenhouse gases into the atmosphere".