Answer:
Option A. The topic that best relates to the central idea in that specific part of the speech is to keep the nation safe.
Step-by-step explanation:
On May 1st, 2003, President George W. Bush gave a televised address from the aircraft carrier USS Abraham Lincoln. The speech is known as "mission accomplished speech" making a reference to end of America's combat in Iraq.
On the passage from the speech shown in the question President Bush is addressing the necessity of keeping the nation safe, and how that mission still continues. He mentions how the terrorist organization "Al-Qaeda" is wounded, but not destroyed" and how it is imperative that America keeps on defending free people against terrorism.