B. Though Benjamin Franklin was known for his instrumental role in the founding of the United States.
This is a sentence fragment, you can tell because saying the sentence in your head or out loud feels incomplete, that is because the sentence wasn't finished, for example, "Though Benjamin Franklin was known for his instrumental role in the founding of the United States, he had many other accomplishments." Is a full sentence.
A complete sentence must include a subject and a predicate.
To me , this means that the scene changed very quickly into something that is more meaningful and intriguing
B.)
The 2 sentences should be turned into one because if the last sentence is left like that, it would be called a fragment/incomplete sent.
