Q.Which of the following correctly shows the order in which systems of exchange evolved in the Indian subcontinent?

Exchange began as direct barter, and only once barter's practical limitations (no common measure of value, no store of value, needing a 'double coincidence of wants') made large-scale trade difficult did a money economy emerge, eventually giving rise to modern commerce with its aids to trade.

Option (a) reverses the actual sequence; (c) and (d) place modern commerce, which needs banking/insurance/transport built on a functioning money economy, before money itself existed.

The historical sequence of exchange systems moved from the simplest form to the most developed. Barter — direct exchange of goods for goods — was the earliest system, used by self-sufficient communities producing a small surplus. As trade grew, barter's limitations (the need for a double coincidence of wants, no common measure of value, difficulty storing or dividing many goods) became serious obstacles, and a money economy emerged to solve them, using a generally accepted medium of exchange. Only once a stable money economy existed could commerce develop its modern form, with specialised aids to trade — banking, insurance, transport, warehousing, advertising — built on top of a monetary system to manage exchange across greater distances and time.

Option (a) reverses the true order. Options (c) and (d) are both impossible because modern commerce's aids to trade (banking, credit, insurance) themselves depend on a functioning money economy already being in place — modern commerce cannot precede money, and barter cannot follow modern commerce.

Students sometimes think 'modern commerce' means simply 'a lot of trade happening', and so place it early — the key distinguishing feature of modern commerce is its reliance on the aids to trade, which themselves require a money economy to already exist.