A person standing on the top of a building of height $60\sqrt{3}$ feet observed the top of a tower to lie at an elevation of $45°.$ That person descended to the bottom of the building and found that the top of the same tower is now at an angle of elevation of $60°.$ The height of the tower (in feet) is

• A

  $30$
• B

  $30(\sqrt{3}+1)$
• Correct answer
  C

  $90(\sqrt{3}+1)$
• D

  $150(\sqrt{3}+1)$

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