How did european imperialism change over the course of the 19th century

The actual answer for APEX is countries that had not participated in earlier waves of imperialism began to establish empires.

with my knoladg i would say it was c

the triple alliance. germany and austria-hungary were already allies by 1879 when, worried about a threat from russia, they formed the dual alliance. italy joined the group in 1882. there was a concern about a possible attack from france and the alliance needed powerful friends to defend it.