It burns the prettiest of any wood . ( positive) ?

To understand why option C "No other wood burns as pretty as it" is the correct answer, we need to analyze how to convert a superlative degree sentence into its positive degree.

The original sentence states, "It burns the prettiest of any wood." Here, "the prettiest" is a superlative form, highlighting that this particular wood burns in a way that is prettier than any other type of wood. When transforming this into the positive degree, we follow a specific formula: "No other" + singular noun + verb + "as" + positive adjective + "as" + subject of the original sentence.

Applying this formula:
1. Start with "No other" followed by the singular noun "wood."
2. Then we add the verb "burns."
3. We incorporate the positive form of the adjective; in this case, "pretty."
4. Finally, we include the original subject, which is "it."

Thus, we arrive at "No other wood burns as pretty as it." This structure directly compares the wood in question to all other woods without asserting its superiority in a superlative manner, which is exactly what a positive degree does.

To remember this concept easily, focus on the transformation rules: No other + singular noun + verb + as + positive adjective + as + original subject. These comprised elements help clarify the structure for shifting between degrees of comparison.