Why was December 7th, 1941, a "date that will live in infamy"?

Question 7 options:

It was when Germany invaded Poland.

It was when Italy invaded Ethiopia.

It was when Japan attacked Pearl Harbor.

It was when the US and Britain invaded France.

It was the day of attack on Pearl Harbor

Explanation:

“the iliad” (gr: “iliás”) is an epic poem by the ancient greek poet homer, which recounts some of the significant events of the final weeks of the trojan war and the greek siege of the city of troy (which was also known as ilion, ilios or ilium in ancient times).

the correct answer is a