From late 1941 into early 1942, World War II in the Pacific experienced:

1.(i am not sure) a string of American victories that put Japan on the defensive

2.(wrong) the Japanese invasion and capture of Australia

3.(wrong) the Japanese on the Philippines surrender to General Douglas MacArthur

4.(possible) a succession of Japanese victories that saw numerous Allied outposts fall

5.(wrong) China finally surrendering to Japan

You're right -- it's either 1 or 4.

I see 4 as a more possible answer.

Because in the timeline there is no mention of AMerican victories at the time.

Right. 4 is the answer.

From late 1941 into early 1942, World War II in the Pacific experienced a succession of Japanese victories that saw numerous Allied outposts fall.

From late 1941 into early 1942, World War II in the Pacific experienced a succession of Japanese victories that saw numerous Allied outposts fall.