Final answer:
The U.S. was driven to ally with France and Britain in WWI primarily due to economic interests and the threat to American ships from German submarine warfare.
Step-by-step explanation:
The question of what drove the US towards allying with France and Britain in World War I can be answered as C) Economic interests and threats to American ships.
American trade was significantly oriented towards Britain and France, partly due to the effective British naval blockade of Germany.
When Germany's unrestricted submarine warfare began threatening American ships, combined with other factors like the Zimmermann Telegram proposing a German-Mexican alliance against the United States, it culminated in the U.S. joining the Allies against the Central Powers.