Answer:
<em>Despite the absence of reference text, the Korean War which was fought by the communist-backed North Korea and the US-backed South Korea was tragic due to the fact that many of the families affected by the war were forced to part ways. Moreover, famine and a series of dictatorial regimes plagued the two countries even after the signing of the Korean truce.</em>
Explanation:
They fall in love i guess
If you read each of these, or speak them, there is only one that suits the sentence correctly.
Go with the third one. Couldn't seems to fit pretty well there.
Fusion of two germs nuclei
