Why did roosevelt choose senator harry s. truman as his running mate for the election of 1944?

The correct answer is sentence number 3.

The sentence that should be revised to improve this paragraph's sentence fluency is "Franklin helped Paine move to Philadelphia, where he pursued a career in journalism, he became the editor of Pennsylvania Magazine."

When writing a story, it is very important to consider the fluency of the sentences for better reading and understanding. Otherwise, the readers could get confused or the sentences could sound strange. That is what happens with sentence number 3 and it should be revised and corrected. Never forget to also check grammar and spelling, and always use the proper sources of information.