Which ligaments support the breast and can cause sagging when weakened?

The correct answer is D.

The suspensory (Cooper's) ligaments are fibrous connective tissue bands that extend from the deep fascia over the pectoralis major muscle through the breast tissue to the skin. These ligaments provide support and maintain the shape of the breast. When these ligaments become stretched or weakened due to factors like age, gravity, or pregnancy, they lose their ability to support the breast tissue, leading to breast sagging (ptosis).