The "action" word in a sentence is also known as a

verb

Explanation: verbs describe what,who,when,where of the noun

It is known as verbs (action verbs or dynamic words)

Explanation:

An action verb(verbs) explains what the subject of the sentence is doing or has done.

sentence -Marie is throwing a ball.

Eg of vebs are throwing ,ran ,play etc.

Verbs also describe nouns on the basis of who,when,what,where

in the following paragraph, the fourth sentence the correct answer is: three personal subject pronouns

”she was embarrassed when she found that they had been put back on the shelves…”

a   subject pronoun is a personal pronoun. i, you, he, she it, we, they.  

in the sentence it can be observed she, used twice and they used once. is for this reason that is a three personal subject pronoun sentence.