Answer:
B
Explanation:
The word "staples" in this context means an important element in something. Protein, fruits, vegetables and dairy are the main and important parts of a healthy and balanced diet.
Let's analyze our answer choices.
A: They are a popular part of a healthy diet
This statement may be true, but the word "staples" doesn't suggest popularity of foods.
B: They are a necessary part of a healthy diet.
This answer choice is correct. Staples are important, or necessary parts of the diet.
C: They are a fraction of a healthy diet.
Things like fruits and vegetables shouldn't be a fraction of a healthy diet, and the word "staples" doesn't mean a fraction or small part.
D: They are the whole of a healthy diet.
This choice is also incorrect. A healthy diet can also include things like sugar, just not in large quantities.
The best answer choice is B: They are a necessary part of a healthy diet.
