💡 Detailed Explanation
The correct choice is Option 2: 'Turn on the washing machine switch.' Although the husband is ready to leave for the supermarket immediately, the wife interrupts: '出かける前に、洗濯機を回しておいてくれる？' (Before you go out, could you run the washing machine?). The husband agrees: 'スイッチを入れてから出かけるね' (I'll turn on the switch and then go out). Thus, starting the laundry is the absolute first action.