Which was a cause of world war ii? (i know a lot of causes, but not sure about these)

a. the british and french of appeasement
b. the establishment of german colonies in africa
c. the u. s. decision to join the league of nations
d. the invasion of austria by italy

Germany italy and japan formed the tripartite pact in part because they: a. hoped to convince the united states to stay out of world war ii b. share the ruling philosophies based on communist economics c. resented the agreements they were forced to sign at the munich conference d. believed their territories were threatened by aggressive foreign states