Examine the timeline and answer the question that follows. based on the information in the timeline, which causal explanation for u. s. involvement in world war two is most likely accurate?

september 1, 1939-- germany invades poland.
september 27, 1940-- germany, japan and the soviet union sign and pact stating the will not attack each other and will provide military assistance if attacked by a nation not already involved in the war.
december 7, 1941 --japanese bombers destroy large portions of the u. s. navy fleet at pearl harbor.
december 8, 1941--the united states declares war on japan.
december 11, 1941-- germany declares war on the united states.
december 11, 1941-- the united states declares war on germany.

a. the united states became involved in world war two to weaken the alliance of germany japan and the soviet union

b. the united states became involved in world war two to protect european allies attacked by germany.

c. the unites states entered world war two because japan attacker its navy

d. the united states entered world war two because both japan and germany declared war on it.