The quantity demanded of a good or service is the amount that.AConsumer plan to buy during a given time period at a given priceBFirms are willing to sell during a given time period at a given priceCA consumer would like to but might not be able to affordDIs actually bought during a given time period at a given price

ANSWER
The sequence of the origin of life events is as follows-
The organic monomers were synthesised first and then the formation of the organic polymers took place.
all these organic compounds were then aggregated together and surrounded by a feeble membrane. this structure was known as the protobionts.
Much more  complex DNA based genetic system evolved after that
SO, the correct option is 'II, III, I, IV'