The question didn't specifically ask for temperature and pressure; they asked for conditions with reference to the graph. This means that you talk about all the conditions, and talk about the graph in relate to temp and pressure. To talk about temp conditions, you have to say that haber process uses moderate temperatures of 400-450 degrees, however the graph shows that maximum yield is obtained from 500atm and 200 degrees. This low temperature would however mean that the reaction rate is very slow so production isn't efficient, thus that's why 400 degrees is usually used. To further compensate for the slow reaction rate, magnetite catalyst is used. For a six mark question, I don't think talking only about temperature and pressure is enough tbh