(B) Salim's income will increase.
Credit helped Salim meet working capital needs, complete production on time, deliver the order, and make a good profit — thus increasing his income.
Source: Money and Credit, Chapter 3 (Festival Season example)
The passage explicitly states: "Credit helps him to meet the ongoing expenses of production, complete production on time, and thereby increase his earnings." Options A, C, and D describe negative outcomes of credit (debt trap, burden, decreased production), which apply to Swapna's case, not Salim's. Examiners expect you to link "positive impact" directly to increased earnings/income.