Which of the following is considered one of the primary causes of the Great Recession? unsustainable sharp drop in US housing costs, particularly for home ownership, coupled with large rise in home mortgage borrowing unsustainable sharp increases in US housing costs, particularly for home ownership, coupled with large rise in home mortgage borrowing unsustainable sharp drop in US housing costs, particularly for home ownership, coupled with large decline in home mortgage borrowing unsustainable sharp increases in US housing costs, particularly for home ownership, coupled with large decline in home mortgage borrowing