The distance between centre of the earth and moon is 384000 km. If the mass of the earth is 6 × 1024 kg and G = 6.66 × 10-11 Nm2/kg2. The speed of the moon is nearly

• A. 4 km/sec
• B. 8 km/sec
• C. 11.2 km/sec
• D. 1 km/sec