Fastest and correct answer will get brainliest answer (easy)

read the following speech excerpt and then select the correct answer to the question below:

president george w. bush’s speech to the troops on the uss abraham lincoln
the war on terror is not over, yet it is not endless. we do not know the day of final victory, but we have seen the turning of the tide. no act of the terrorists will change our purpose, or weaken our resolve, or alter their fate. their cause is lost. free nations will press on to victory.

which topic best relates to the central idea in this part of the speech?

a. winning the war on terror
b. backing out of the fight
c. fighting a lost cause
d. avoiding future conflicts