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 Let us number the instructions as $I_1$, $I_2$, $I_3$, and $I_4$ respectively.

  1 2 3 4 5 6 7 8 9 10 11 12
$I_1$ IF ID EX EX EX WB            
$I_2$   IF - - ID EX WB          
$I_3$     IF - - ID EX WB        
$I_4$       IF - - ID EX EX EX WB  

 

Hence, it will take $11$ clocks to execute the given instructions with operand forwarding.

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