$A$ man starts from his home and walks $10 \, km$ towards South. Then he turns right and walks $6 \, km$,again he turns right and goes $10 \, km$. Finally,he turns right and walks $5 \, km$. At what distance is he from his starting point? (in $km$)

  • A
    $31$
  • B
    $2 \sqrt{101}$
  • C
    $1$
  • D
    $\sqrt{125}+\sqrt{136}$

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