Sulfur dioxide . A.) creates a reddish-brown haze in the sky
B.) is a secondary air pollutant
C.) has an irritating odor and is colorless
D.) is relatively harmless to the environment
Answer is C

C.) has an irritating odor and is colorless

Explanation:

Sulfur dioxide is a chemical compound that's very toxic, non-flammable, colorless, and has a pungent odor. It's chemical formula is .

the median of the data is 4.5.

i might be wrong but i think its a. let me know if i’m right and have a good rest of your day!