A retaining wall retains a sand strata with $ϕ = 30 °$ upto its top. If a uniform surcharge of $12 t / m^{2}$ is subsequently put on the sand strata, then the increase in the lateral earth pressure intensity on the retaining wall will be

- 1
  
  $1 t / m^{2}$
- 2
  
  $2 t / m^{2}$
- 3
  
  $4 t / m^{2}$
- 4
  
  $8 t / m^{2}$

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