Which statement best describes semaglutide's main actions relevant to weight loss?

• A. It is a GLP-1 receptor agonist that improves glucose regulation and suppresses appetite.
• B. It is a stimulant that increases resting metabolic rate and raises overall energy expenditure.
• C. It inhibits intestinal lipases, reducing absorption of dietary fats and calories.
• D. It blocks thyroid hormone receptors, decreasing appetite and increasing metabolic rate.