N
M
L
K
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myschool, The Correct Option Is B. from the word "GRAND", grand period of growth is characterised by a "rapid growth". 'M' in the sigmoid curve represented the log or exponential phase where growth is rapid and the 'N' represented the lag phase where growth is slow.
N aka lag phase
M aka exponential stage or grand stage
L aka diminishing stage
K aka stationary stage
Grand period of growth is otherwise called as exponential phase, where the maximum growth takes place in minimum duration. It remains unaffected when light intensity is changed.
B 
It has been many years that they have complained about the answer either you explain it or you tell us the correct answer so we would know the answer before we go sit for our exam , please check it .
I'd the answer A OR B
