Which of the following describes only RNA?

I'm not sure what the options are but rna or ribonucleic acid is made up of a nucleobase called uracil instead of thymine (which is what dna has). It kinda looks like half of dna.  

significant amounts of nitrogen oxides, carbon monoxide, and other pollution

explanation:

passenger vehicles are a major pollution contributor, producing significant amounts of nitrogen oxides, carbon monoxide, and other pollution. in 2013, transportation contributed more than half of the carbon monoxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air.

because of