Try Again.

Benzene can be found in gasoline but
it's not an important greenhouse gas.

FYI - Benzene is toxic and known to cause cancer. Benzene that leaks out of underground gasoline storage tanks can contaminate groundwater.

Benzene is an important industrial chemical used to make plastics and synthetic fabrics such as nylon and polyester.

Carbon dioxide is right!

FYI - Rising atmospheric CO₂ is the greatest cause of human-induced global warming today.  CO₂ is released whenever carbon-based fuels such as wood, alcohol, coal, oil, gasoline, and natural gas are combusted. Combustion processes release CO₂ that was previously locked into these materials by photosynthesis.

An average car emits about 10,000 pounds of CO₂ every year.  The fuels used to generate electricity are also an important source of CO₂.

Mostly right.

Ozone (O₃) is a powerful but less significant greenhouse gas than CO₂. It is an indirect product of gasoline combustion. Smog, including ozone, forms in the atmosphere when sunlight reacts with certain chemical ingredients. Gasoline combustion doesn't produce ozone, but it produces some of the ingredients that turn into ozone. Ozone in ground-level smog damages our lungs, but a concentrated layer of it in the upper atmosphere provides essential protection against the Sun's deadly UV rays.