D. 1
ExplanationStep 1: Identify definite integral. Step 2: For constant 1 the area is interval length 2-1=1. so the correct option follows. Step 3: In exam questions apply the formula first.
Step 1: definite integral पहचानें। Step 2: constant 1 के लिए area interval length 2-1=1 है। इसलिए सही विकल्प मिलता है। Step 3: ऐसे प्रश्नों में पहले सूत्र लगाएँ।
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