This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Anatomy
A 47-year-old female patient's right breast exhibited peau d'orange characteristics. This condition is primarily a result of which of the following occurrences? 
Select and explain. 
A. Blockage of cutaneous lymphatic vessels, B. Shortening of the suspensory ligaments by cancer in the axillary tail of the breast, C. Contraction of the retinacula cutis of the are ola and nipple, D. Invasion of the pectoralis major by metastatic cancer
A: Blockage of cutaneous lymphatic vessels
Answer: A: Blockage of cutaneous lymphatic vessels 
Explanation: Blockage of cutaneous lymphatic vessels results in edema of the skin surrounding the hair follicles, leading to an appearance like an orange peel (peau d'orange). Shortening of the suspensory ligaments leads to dimpling of the overlying skin, not peau d'orange. Contraction of retinacula cutis results in retraction and inversion of the nipple and/or areola. Pectoralis major involvement has nothing to do with this condition but can result in fixing the tumor firmly to the chest wall.