Read the following sentences and find out what kind of adverb the underlined ones are.
I am so sad.

The correct answer is: Adverb of degree

Solution : Option(a) Adverb of Degree
Adverbs of Degree are used to discuss the degree or intensity of an adjective, an action or another adverb. Example- very, too, much, so etc.
Here, in the sentence "I am so sad" , the adverb "so" is Adverb of degree.