If the partial safety factor on crecrete is 1.5, the design force of compression in the reinforced concrete beam is

where $b_{x}$ is the ara of compression block

- 1
  
  $0.32 σ_{c k} b_{x}$
- 2
  
  $0.33 σ_{c k} b_{x}$
- 3
  
  $0.36 σ_{c k} b_{x}$
- 4
  
  $0.34 σ_{c k} b_{x}$

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