Match the List-I with List-II and select the correct response from the potions given thereafter:
| List-I | List-II |
|---|---|
| a) The British government established monopoly in opium trade in Bengal. | 1) 1780s |
| b) The British government exported 50000 chests of opium from Bengal annually. | 2) 1820s |
| c) Opium production in British occupied territories declined rapidly. | 3) 1870 |
| d) Village headmen started paying peasants for producing opium in advance. | 4) 1773 |