I want to know the answer to the following question:
What four Arab countries entered British Mandatory Palestine?
All the background I'm provided with is that "The following day, the armies of four Arab countries—Egypt, Syria, Transjordan and Iraq—entered what had been British Mandatory Palestine, launching the 1948 Arab–Israeli War; Contingents from Yemen, Morocco, Saudi Arabia and Sudan joined the war.". Is that enough to answer the question?
Answer: yes