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

The correct answer is option C, that is, has an irritating odor and is colorless.

Explanation:

Sulfur dioxide refers to a gas. It has a nasty, sharp smell and is invisible. It associates with other components to produce harmful compounds like sulfurous acid, sulfuric acid, and sulfate particles. It is the chemical compound with the formula SO. At standard temperature, it is a toxic gas with an irritating and pungent smell. The gas is released naturally by the volcanic activity.

i think its 100

i hope this !

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)