Which coal is low-grade, brown and soft with high moisture content?

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1. Understand coal ranks:

- Lignite (brown coal) is a low-rank coal: soft, brown, and contains high moisture — typically about $30\%-60\%$.
   - Bituminous is a medium-rank coal (harder, higher carbon than lignite).
   - Anthracite is the highest-rank coal (hard, high carbon, low moisture).
   - Metallurgical (coking) coal is a type of bituminous coal used in steelmaking (not low-grade).

2. Match to options:

- (2) Lignite matches the description "low-grade, brown and soft with high moisture content."

Therefore the correct choice is option (2) — Lignite.

FINAL_ANSWER: b

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