What will be the correct answer?

Dear Student, answer is already provided in the image posted by you. But, as per my opinion, the answer will be (Option a) because, there will be indirect impact on the national income. Currency depreciation takes place when there is an increase in price of a foreign currency. Then more rupees are required to buy one dollar, i.e., the value of domestic currency becomes less valuable in relation to a foreign currency. Henceforth, the quantum of imports will reduce and the exports will increase, and thereby leads to an increase in national income. REGARDS.