Final answer:
The correct equation representing that Ann's brother has twice as many apples as Ann is b = 2c, which indicates that the brother's number of apples is double that of Ann's number of apples (c).
Step-by-step explanation:
The question provided by the student is regarding the creation of an equation to represent the relationship between the number of apples Ann has and the number her brother has. Since Ann has c apples and her brother has twice as many, the equation reflecting this relationship would be b = 2c, where b represents the number of apples Ann's brother has.
To solve problems like these, it is essential to translate the word problem into a mathematical expression. If the number of apples that Ann's brother has is twice the number that Ann has, we simply multiply Ann's quantity by 2 to represent her brother's quantity. Hence, the correct equation that describes this situation is b equals two times c (b = 2c), which corresponds to choice d in the question.