Question

Identify the prepositional phrase. The headlines announced a truce between the two countries. The headlines announced between the two countries announced a truce a truce between

Answer 1

"between the two countries"

A prepositional phrase needs to contain  a preposition, in this case it would be "between". As well it needs to modify the sentence and it should mention the object of the sentence. So "between the two countries" is correct.

Answer 2

between the two countries, hope it helps