Which statement best explains the effectiveness of this introduction paragraph? Smoothies can be made at home. There's no need to head down to the local smoothie shop for a refreshing and healthy snack. With just a blender, a few pieces of fruit, and a dab of yogurt, you can make your own sweet treat.

A. The introduction is effective because the first sentence helps make the main idea of the essay seem important and fascinating.
B. Although the introduction presents valid background information, it is ineffective because the main point of the essay is unclear.
C. The introduction is effective because it establishes credibility by giving background information that shows that the author is an expert.
D. Although the introduction establishes a strong focus, it is ineffective because the first sentence does not introduce the topic in an engaging way.