In 1998, two years after signing the Dayton Accords, Serbia

O united with Bosnia.

O welcomed NATO.

O resumed fighting.

O stopped fighting.

Resumed fighting

Explanation:

In 1998 and 1999, Serbian forces brutally suppressed an uprising by ethnic Albanian separatists in Kosovo, which was then part of Serbia, until a NATO bombing campaign against Serbia, led by the United States, forced Serbia to give up on the war.

NATO launched air strikes after the failure of peace talks that were meant to end Yugoslav President Slobodan Milosevic's violent campaign against Kosovo Albanians. During the bombing, Yugoslav forces carried out an extensive campaign in Kosovo, resulting in the expulsion of much of the Kosovo Albanian population