$A$ nail is driven into the trunk of a $30$ year old tree at a point $1$ meter above the soil level. The tree grows in height at the rate of $0.5$ meters a year. After three years,the nail will be

  • A
    $1$ meter above the soil
  • B
    $1.5$ meters above the soil
  • C
    $2$ meters above the soil
  • D
    $2.5$ meters above the soil

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