Final Answer:
For finding articles in a wide range of subject areas, a comprehensive set of articles on an in-depth research topic, and general search features with quick access to full-text, the most suitable tool would be Quick Search (Option B).
Step-by-step explanation:
Quick Search is a versatile tool that is effective for broad searches across various subject areas. It provides a comprehensive set of articles, making it suitable for general research inquiries. Additionally, its general search features make it convenient for quick access to full-text articles. On the other hand, the Article Index (Option A) might be more specialized, offering customized search features tailored to specific subject areas. However, for a wide-ranging exploration or in-depth research on a specific topic, Quick Search stands out as the more appropriate tool.
In summary, Quick Search is the preferred option for its versatility and efficiency in handling diverse research needs.
Option B is the answer.