Preparation for the AP® exam, much like the work of historians, will involve . . . a
analyzing both primary and secondary sources
b
making judgments about connections among historical events
c
skills in developing and writing essays
d
all of the above

D. All of the above

Explanation:

Historians are those who study the histories of different subjects and how these things happened. This is usually done with the use of primary sources which include old writing and diaries from that period of study or the use of secondary sources such as modern books which are gotten from primary sources.

In preparation for the AP® exam, much like the work of historians, will involve analyzing both primary and secondary sources , making judgments about connections among historical events and skills in developing and writing essays to make it presentable.

alliances in ww1 were different from ww2 because the entente in ww1 made up of serbia,russia,france,britan,japan and italy later america  and all allied in a sort of balance of power and too keep germany,austria-hungary,and the ottomans down. russia allied the serbians in order to exert its influence in the balkans while france allied the russians because france was still in dismay and insulted after the defeat to the germans during the unification of germany and britian allied the belgians after the germans invasion of belgium.in ww2 the alliances were in a preemptive attempt to deter any further wars into happening while germany and italy allied since they were insulted and humiliated after the previous war while also sharing a similar ideology of facsim along with japan which all 3 had a want for world domination and agreed to assist one another in the endevours 

explanation: