Question

Brainliest answer available.

Answer 1

I believe the correct answer would be 3.) They fought each other over philosophical differences but also teamed up to fight outside invaders, after which their differences caused friction that pushed them apart once again.

While 2 would make sense because of the origins of the Communist party within the Nationalist party, but they never began as allies. 1 would be false because the Communist party formally began around 1929. 4 would be false because they did not coexist peacefully prior to 1960. 

Hope I could help!

Answer 2

I think the correct answer would be 3?

They fought each other over philosophical differences but also teamed up to fight outside invaders, after which their differences caused friction that pushed them apart once again.

I just took the test with the same question so I'm pretty sure it's correct.