Final answer:
The best title for the provided passage is 'C. The Honeybee — Its Characteristics and Usefulness,' as it covers the main topics, including the honeybee's role in pollination and its economic importance.
Step-by-step explanation:
The best title for the reading passage that encompasses its main themes and details is C. The Honeybee — Its Characteristics and Usefulness. This title accurately reflects the content of the passage which provides a comprehensive overview of the honeybee's role in pollination, its social structure, and its importance in producing honey and wax that are used by humans in various products. The passage goes beyond just the process of making honey or the diversity of bee species to highlight the honeybee's unique contributions and the implications of their potential decline due to issues like colony collapse disorder.