The area of the region covered by the TV broadcast, by a TV tower of $100\mathrm{ }\mathrm{m}$ height is (Take, the radius of the earth, $R_e=6.4\times {10}^6 \mathrm{m}$ )

• A

  $12.8\mathrm{\pi }\times {10}^8{\mathrm{km}}^2$
• Correct answer
  B

  $1.28\mathrm{\pi }\times {10}^3{\mathrm{km}}^2$
• C

  $0.64\mathrm{\pi }\times {10}^3{\mathrm{km}}^2$
• D

  $1.28\times {10}^3{\mathrm{km}}^2$

Hence, the correct answer is option: 'B'.