Which of the following definitions applies to permafrost?

AA long, narrow, deep inlet of the sea between steep slopes.

BPermanently frozen subsoil, occurring in perennially frigid areas.

CA treeless area between the icecap and the tree line of Arctic regions, having permanently frozen subsoil and supporting low-growing vegetation such as lichens, mosses, and stunted shrubs.

DA subarctic, evergreen coniferous forest of northern Eurasia located just south of the tundra and dominated by firs and spruces