Final answer:
The message George W. Bush directed at the terrorists in his speech can be best captured by the statement 'Don't expect conventional tactics.'
Step-by-step explanation:
The message George W. Bush directed at the terrorists in his speech can be best captured by option B. Don't expect conventional tactics.
In his address to a joint session of Congress, Bush declared war on terrorism and demanded that the Taliban turn over Osama bin Laden or face an attack by the United States. This speech encapsulated the belief in the Bush Doctrine, which advocated for preemptive actions against America's enemies. By stating that terrorists should not expect conventional tactics, Bush was warning them that the United States would use unconventional methods to combat terrorism.