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

  $1.5$ meter above the soil

• C

  $2$ meters above the soil

• D

  $2.5$ meters above the soil