Read these sentences from a famous speech made by President Roosevelt in 1941.

Yesterday, December 7th, 1941 – a date which will live in infamy – the United States of America was suddenly and deliberately attacked by naval and air forces of the Empire of Japan. The United States was at peace with that nation and, at the solicitation of Japan, was still in conversation with its government and its emperor looking toward the maintenance of peace in the Pacific.
–President Franklin D. Roosevelt, 1941

To which event was the president referring?

the Battle of Guadalcanal
the Bataan Death March
the attack on Pearl Harbor
the Battle of Midway

The attack on Pearl Harbor.

Explanation:

The given speech is quoted from the "Infamy Speech" given by President Franklin D. Roosevelt in 1941 after the unprovoked attack by the Empire of Japan on the United States' military base in Pearl Harbor. This speech also signals the involvement of the United States into the Second World War.

The surprise attack on the United States by the Japanese troops even while still in conversation with each other led to the "immediate' declaration of war on Japan by the US. This further propels the nation to be involved in the Second World war, and also signals an end in the US-Japan relationship.

a.   it resulted in widespread unemployment.

the correct answer is to reduce tax