The answer is D. Remain.
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"Justice will be done" were the words that George Bush said in his speech on September 20, 2001, when the twin towers were demolished by Al - Qaeda terrorists. The feeling evoked by the president of the United States is revenge because in addition to the threat he made to terrorists, he also warns all countries saying that "Either you are with us, or you are with the terrorists." Starting the so-called "war against terrorism" that put justice in the hands of the United States and the way to enforce it is weapons.
Do it you self . use you brain and the knowledge god blessed you with
The first one is right. it joins two independent clauses with a comma followed by a conjunction.