To determine which statement is correct, let's analyze the descriptions of Substance A and Substance B based on the characteristics of minerals.
- Minerals are defined as naturally occurring, inorganic solids with a definite chemical structure.
- Substance A is described as organic, naturally occurring, and solid. The fact that it is organic suggests that it is derived from living organisms and thus is not a mineral.
- Substance B is described as having a definite chemical structure and is naturally occurring. While the provided information does not specify that it is inorganic, having a definite chemical structure does align with mineral characteristics. However, we can't definitively categorize it as a mineral without information about whether it is organic or inorganic.
Given this analysis:
- Substance A is not a mineral because it is organic.
- Substance B could be a mineral, as it has a definite chemical structure and is naturally occurring, but we can't confirm it without knowing if it's inorganic.
Therefore, the correct statement among the given options is: Substance A is not a mineral. Substance B could be a mineral.