Assertion: Marwari is most important dialect, sometimes synonymous with Rajasthani. Reason: Marwar holds important place historically and geographically.

उत्तर: (A) दोनों सही हैं, R, A की व्याख्या करता है — Both Assertion and Reason are correct, and the Reason correctly explains the Assertion. The factual connection between the two statements is direct and causal.