In the question given below, the sentence is divided into three parts I, II, III. For each part, an alternate statement is also given. You have to determine if a part requires correction, and then mark that as your answer.

The U.S. was offering support to Saudi Arabia’s campaign/ against the Houthi rebels in Yemen/ when Barack Obama is the president.

I. The U.S. offered support to Saudi Arabia’s campaign

II. against a Houthi rebels in Yemen

III. when Barack Obama was the president.