In the middle east at the end of 2012, was not a major u. s. concern.

a ending the civil war in syria
b preventing iran from developing nuclear weapons
c settling disputes between palestinians and israelis
d rebuilding the government of libya

aending the civil war in Syria

Explanation:

The Syrian civil war is a warlike conflict initiated in Syria. In its beginning, the Syrian Armed Forces clashed with armed rebel groups, known in the West as the Syrian opposition. Later, numerous rebel groups and fighters joined the Islamic State of Iraq and the Levant, ISIS, which allowed it to invade vast areas of Syria from Iraq. For 2017, the Syrian government undertook a major campaign against Daesh recovering territories west of the Euphrates, on December 6 both Syrian and Russian authorities proclaimed the end of the operation against Islamic State.