To solve this problem, we need to match the microorganisms in Column I with their corresponding products or uses in Column II. Let's analyze each microorganism:$\newline \bullet$a. Clostridium butylicum: This bacterium is known for producing butyric acid.$\newline$ - This matches with (ii) Butyric Acid.$\newline \bullet$b. Trichoderma polysporum: This fungus is known for producing Cyclosporin-A, an immunosuppressive drug.$\newline$ - This matches with (i) Cyclosporin-A.$\newline \bullet$c. Monascus purpureus: This fungus is used to produce statins, which are blood cholesterol-lowering agents.$\newline$ - This matches with (iv) Blood cholesterol lowering agent.$\newline \bullet$d. Aspergillus niger: This fungus is commonly used in the industrial production of citric acid.$\newline$ - This matches with (iii) Citric Acid.$\newline$Now, let's match the items from Column I with Column II:$\newline a \rightarrow ii, b \rightarrow i, c \rightarrow iv, d \rightarrow iii \newline$This corresponds to Option 1.