If there are two primary sources for a historical event which differ in many aspects, what could be asked to identify what is correct and what is not ?

Correct option is B

The correct answer is (b) What are the reasons for the differences in the two versions?
When two primary sources for a historical event differ in many aspects, it is important to identify the reasons for these differences in order to determine which source is more accurate or reliable. This may involve examining the credibility of the sources, the authors' biases, and the historical context in which the sources were created.
Option (a) is incorrect because the legibility of the calligraphy is not relevant to the accuracy of the information contained in the source.
Option (c) is incorrect because the source created on the order of a powerful authority is not necessarily more accurate or reliable than a source created by an independent observer.
Option (d) is incorrect because the form of the source (written or oral) is not relevant to its accuracy or reliability.