1. Problem: Given that 3 out of every 100 people are illiterate, find the number of illiterate people in a population of 1,500,000. 2. Formula: Use the proportion formula for ratios: $$\text{Illiterate} = \frac{3}{100} \times \text{Total population}$$ 3. Calculation: $$\text{Illiterate} = \frac{3}{100} \times 1,500,000 = 0.03 \times 1,500,000$$ 4. Simplify: $$0.03 \times 1,500,000 = 45,000$$ 5. Explanation: Since 3 out of every 100 people are illiterate, multiplying the total population by 0.03 gives the total number of illiterate people. Final answer: 45,000 people are illiterate in the kabupaten. Therefore, the correct choice is C. 45,000 orang.