Final answer:
Article I of the United States Constitution is most closely associated with powers that can indirectly relate to corporations, public transportation, and branch banking. The 'full faith and credit' clause, which applies to interstate relations, is found in Article IV.
Step-by-step explanation:
The article that deals with subjects such as corporations, public transportation, and branch banking is not explicitly outlined in any specific article of the United States Constitution, as these are more specific issues that fall under the broader powers granted to the federal and state governments. Issues related to corporations, public transportation, and branch banking might be most closely associated with the powers granted to Congress in Article I, specifically in Section 8, which includes the power to regulate commerce among the states and coin money, which could indirectly relate to corporations and banking. Regarding public transportation, while the Constitution does not explicitly mention it, the power to establish post offices and build roads could be seen as an early form of addressing transportation needs.
As for the "full faith and credit" clause, it applies to interstate relations according to Article IV of the U.S. Constitution. This clause ensures that each state respects the public acts, records, and judicial proceedings of every other state.