💡 Detailed Explanation
The correct choice is Option 2: 'Excuse me, may I order?' This is the standard way to call a waiter in a restaurant when you are ready to order. Option 1 ('すみません、お願いします' - Excuse me, please) is too generic on its own when first calling a server, though '注文、お願いします' is correct. Option 3 ('すみません、お勘定します' - Excuse me, check please / I will pay) is used when you want to pay the bill and leave, not when you want to order.