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The correct answer is option 4, Anthracite coal.
To understand why, let`s examine the other options:
1. Lignite coal: Lignite coal is a type of coal that is low in carbon content and high in moisture. It contains around 25-35% carbon, making it lower in carbon content compared to anthracite coal.
2. Peat coal: Peat coal is the lowest grade of coal and is formed by the partial decomposition of vegetation. It has a carbon content of around 45-55%, which is higher than lignite coal but still lower than anthracite coal.
3. Bituminous coal: Bituminous coal is a widely used coal and is intermediate in carbon content. It typically contains around 60-80% carbon, which is higher than both lignite and peat coal, but still lower than anthracite coal.
4. Anthracite coal: Anthracite coal is the highest grade of coal and contains the highest percentage of carbon among the options. It generally contains over 90% carbon, making it the option with the highest carbon content.
Therefore, option 4, Anthracite coal, has the highest percentage of carbon among the given options.