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A blackened bottom on a cooking vessel generally indicates that

Question
A blackened bottom on a cooking vessel generally indicates that
The fuel is burning completely
The stove's air holes are blocked, and fuel is being wasted
Too much oxygen is being supplied
The food is undercooked
Answer
The stove's air holes are blocked, and fuel is being wasted
Detailed Explanation
A blackened, sooty vessel bottom suggests blocked air holes causing incomplete combustion and wasted fuel.
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