$A$ $17 \, m$ long ladder leans on a wall such that its lower end rests $8 \, m$ away from the base of the wall. Then,its upper end reaches to the height of $\ldots \ldots \ldots \, m$ on the wall.

  • A
    $12$
  • B
    $18$
  • C
    $15$
  • D
    $20$

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