Final answer:
The boston butt is the least tender primal cut of pork, due to its higher collagen content and connective tissue. Slow-cooking is recommended for this cut to achieve tenderness. The correct option is d.
Step-by-step explanation:
The least tender primal cut of pork is the boston butt. The boston butt, also known as the pork shoulder butt, comes from the shoulder area of the pig. It contains more connective tissue and is higher in collagen content compared to other cuts.
Collagen is a tough protein that breaks down during cooking. Therefore, cuts with more connective tissue, like the boston butt, are less tender unless slow-cooked for a long time. Other cuts like the belly, fresh ham, and shoulder can be cooked using different techniques to attain tenderness. Hence, d is the correct option.