$A$ $TV$ tower has a height of $100 \ m$. The average population density around the tower is $1000 \ \text{per} \ km^2$. The radius of the earth is $6.4 \times 10^6 \ m$. The population covered by the tower is:

  • A
    $2 \times 10^6$
  • B
    $3 \times 10^6$
  • C
    $4 \times 10^6$
  • D
    $6 \times 10^6$

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