C is the answer, already answered on my test
The effect of the Donner party is they stopped at a better location with grazing for cattle and shops for wagon repairs. They planned on going fort Laramie but decided to stop at fort Bernard instead which is 10 miles east of fort Laramie because they were warned that Indians were fighting ahead the grazing for cattle was poor at for Laramie and they could get wagon repairs at fort Bernard.
Answer: because it allows a student to explore different points of view and come up with an angle
Explanation:
Cross referencing is when several books, articles or journals are checked and referenced so that one can have different opinions and explanations with regards to a particular topic.
Therefore, based on the explanation, cross-referencing a topic is important for research purposes so that the researcher can have several opinions and then choose the best one or most ideal.