Why is it important for historians to use good quality sources? Relevant sources can be used to investigate a wide variety of historical subjects.
Relevant sources provide support for topics that are unconnected to the historical subject.
Credible sources lead to accurate interpretations of historical subjects because they are trustworthy.
Credible sources lead to better interpretations of historical subjects because they cannot be contradicted.

the right answer for the question that is being asked and shown above is that: "their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful.  " the  participant in european imperialism is being described below is that  their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful. 

um is there supposed to be choices?

i think the answer is   b.