Some reasons to feel optimistic about the war against Islamic State are:
The war against ISIS would be an opportunity to defeat them and eradicate the type of terrorism that they espouse which is violent and uncompromising.
It will also act as a reset button on terrorism in the area that ISIS occupied as the terrorists would be killed which means new terrorists would have to start from scratch.
Also, getting rid of ISIS sends a message to the whole world that any group that causes a menace like ISIS did can be certain of death and annihilation.
Options include:
In conclusion, all options are correct.
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