Analogy — Coal ranks progression: Peat : Lignite :: Bituminous : ? Select the next higher-rank coal that stands to “Bituminous” as “Lignite” stands to “Peat”.

Introduction / Context:
This analogy is based on ordered series within a domain. Coal forms a rank sequence by carbon content: Peat → Lignite → Bituminous → Anthracite (increasing carbon, decreasing volatiles).

Given Data / Assumptions:

• Peat is the lowest-rank precursor; Lignite is the next rank.
• Bituminous is followed by Anthracite in standard rankings.
• Granite/Basalt are rocks; Coke is a manufactured fuel.

Concept / Approach:
Maintain “X : next rank of X”. Thus Peat : Lignite maps to Bituminous : Anthracite.

Step-by-Step Solution:

Verification / Alternative check:
Cross-check that alternatives are not naturally occurring higher ranks following Bituminous.

Why Other Options Are Wrong:

• Granite/Basalt: Igneous rocks; irrelevant.
• Coke: Processed carbon product, not a natural coal rank progression.
• None of these: Invalid since Anthracite fits.

Common Pitfalls:
Picking “Coke” by associating with carbon; the sequence asked is geological rank, not industrial product.

Final Answer:
Anthracite