in this question instruction is : I1-->I2--->I3-->I4-->I5-->I6-->I12-->I13-->I14--->I15--->I16
and its 5 stage pipeline so K=5 and n= 11
here branch penality = target address available - 1
execution time of pipeline = (K+n-1)* tP + (branch penality)* tp
= (5+11-1)*10 +(3-1)*10
= 15*10 + 2*10
= 170 ns
option A is correct