Final answer:
Parenteral nutrition is least likely to be used in the management of inflammatory bowel disease.
Step-by-step explanation:
In the management of inflammatory bowel disease, the least likely treatment option to be used is b. Parenteral nutrition. Parenteral nutrition involves providing nutrients through intravenous (IV) infusion, bypassing the digestive system. It is typically used when the digestive system cannot adequately absorb nutrients, but it is not commonly used as a first-line treatment for inflammatory bowel disease.