C............ glad to help
The statement is a sentence because there is a subject, a predicate, and the thought is complete.
The subject of the sentence is: <span>Samuel Clemens
The predicate is: </span><span>became one of the best-loved American storytellers
with "became" as the verb
</span><span /><span>
</span>
Looking up the word in the dictionary
I got: A. a children's story that teaches a lesson
(apex)