A man leaves for his office from his house. He walks 5 km towards the East, then turns South and walks 3 km. Again, he turns East and walks 4 km. Finally, he turns North and walks 15 km to reach his office. What is the shortest straight-line distance between his house and his office?

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• A 13 km
• B 15 km
• C 17 km
• D 21 km

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