Given the task definition and input, reply with output. In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D". 

[header] How to make a healthy breakfast bowl [title] Choose your base ingredient. [step] When choosing a healthy base ingredient, it's best to find something high in protein, fiber, calcium, and iron. You don't need to choose a base loaded with each of these nutrients, but selecting a base that is high in one or two will give you a lot of nutritional value. <sep> (A) [substeps] Protein-rich breakfast cereals (rice, hard boiled eggs, flavored milk and yogurt) should be a balanced selection. Protein is higher in fiber, calcium, iron, and omega-3 fatty acids. (B) [title] Pre-heat the oven to 350 ° f (177 ° c). [step] Once the oven has been preheated, it's ready to bake. (C) Try to keep saturated and trans fats, sugar, cholesterol, and sodium low. [substeps] Generally, yogurt is high in calcium and protein, especially greek yogurt. (D) [substeps] Some serving sizes include about 50% protein , 2% fiber, and no fat. Go for a base of about 2 , 300 g or about 1 cup per serving.

C