Which research source would provide the most bias free information about Marian Anderson?

Explanation:

The correct answer is C) An encyclopedia entry about Marian Anderson’s life and career .

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. 

we need the answer choices to answer the question