Unfortunately, you forgot to include the information below that identifies events from around the world that affected Americans. What are those events? We need them to help you answer your question.
However, trying to help you we did some deep research and can comment on the following.
Probably, the events that are missing in ypur question are the following.
Explosion in U.S. Marine barracks in Beirut.
Attacks on U.S. Embassies in Kenya and Tanzania.
Attacks on the World Trade Center and Pentagon.
If that is the case, then the correct is B) "Terrorism is now a major threat to U.S. national security.
The conclusion that can be reached from these events is "Terrorism is now a major threat to U.S. national security."
That is why after the terrorist attacks of September 11, 2001, in different areas of the United States, US President George W. Bush ordered the creation of the Homeland Security Department to protect the US citizens. This decision and its consequences such as the Patriotic Act had created many controversies regarding the suppression of liberties for US citizens.
