Correct answer: A. They give information on court administration and political events
Explanation: The direct answer is A: Persian sources give information on court administration and political events. Persian was widely used in the courts and administrations of the Delhi Sultanate and Mughal Empire. Chronicles, official records, biographies and administrative writings can tell historians about rulers, wars, appointments, revenue, court practices and political decisions. The reasoning is simple: if a government used Persian for its official work, many records about that work were also produced in Persian; historians study them as evidence. Option A is correct, although such sources should be read critically because court writers could praise rulers or ignore ordinary people. Option B is wrong because these sources are not merely modern novels. Option C is wrong because they are not only scientific formulas; some may contain scientific knowledge, but that is not their main historical importance here. Option D is wrong because they are not all oral songs; many are written texts. Exam cue: Persian sources are especially important for Sultanate and Mughal administration and political history.