Doubt by Nancy Garg

Sir responses to abiotic factors wale lecture me jo aapne last me graph wala partial regulators wala question btaya tha uska answer (d) hoga kya? 

Answers

Answer by Fatima Zohra

nn correct answer is 1st according to ncert

Answer by Fatima Zohra

but I have also doubt why not 1st

Answer by Pradeep Kumar

ans is d. in all 3 options organism is regulating in a range ( constant graph) but after or before that it is simply conforming.