Gamut means most nearly

• A. Contains words grouped according to similarity of meaning
• B. A label and a book showing who owns it
• C. Entire range
• D. Dictionary of selected terms in a particular book or field

Answer: (B)

Gamut refers to the full extent or range of something—the complete spectrum from start to finish. So the best choice is the one that describes the entire range or scope. The other options point to different library terms: a label indicating ownership is a bookplate, a collection organized by meaning is a thesaurus, and a field-specific list of terms is a glossary.