The correct answer is B) Bosnia.
The following U.S. invasion that President Clinton was justifying in this quote is the invasion of Bosnia.
President Bill Clinton ordered "Operation Deliberate Force" with the help of its allies of NATO, the North America Treaty Organization. President Clinton knew that the use of force was the answer to stop the massacre of civilians in Bosnia. That is when President Clinton said that "If we fail to address these threats today, we will suffer the consequences in all our tomorrows."