Answer:
C. allowing the transportation of arms to the Chinese on British ships.
Step-by-step explanation:
When Japan invaded China, President Roosevelt allowed for British ships to transport China's purchased war goods (arms). This bent the rules of the Cash and Carry policy which basically is this policy that allows the U.S to sell war goods to any nation as long as it's paid in cash and that the goods are carried away on the buyer's own ships. The purpose of this policy was for the U.S to maintain its neutrality and isolationism.