ANS:B - corrosion resistant.

Alloys having more than 80% copper are generally more corrosion resistant. Copper is inherently resistant to corrosion, and alloys with high copper content, such as brasses and bronzes, often exhibit excellent corrosion resistance properties. These alloys form protective surface layers, such as oxides or patinas, which help prevent further corrosion and degradation when exposed to air or moisture. While some copper alloys may also possess other desirable properties such as abrasion resistance or machinability, corrosion resistance is a primary advantage of high-copper alloys. Therefore, the correct completion is: corrosion resistant.