find adverb in "This is one of the most democratic way to buy art. Online galleries can exhibit the work of hundred of artists specializing in many different genres including figurative, abstract, landscape , still life, sculpture and so on. This gives you the widest possible range of art to choose from."
An adverb describes a verb, an adjective, or another adverb. Adverbs describe by telling where, how, when, how much...
http://grammar.ccc.commnet.edu/grammar/adverbs.htm
In this quotation, there is only one adverb and it's describing an adjective -- telling how much.
If you post what YOU THINK it is, I'll let you know if you're right or not.