Steps needed: Find what a house purchase usually requires for down payment.
Answer: Whenever you buy a house, you don't always want to pay it full price, so you go to the bank to borrow some money. Even though you don't want to pay it full price, you still should pay a big ton of it so that you don't have to end up borrowing a lot of money from the bank, which you would then have to pay back twice as much to them. So the answer is D. A lump sum.