Final answer:
To accurately determine the minimum number of pencils Sam needs to purchase to match the number of erasers, we need more context from the original question, which is not provided in this case.
Step-by-step explanation:
To determine the minimum number of pencils Sam will have to buy to have the same number of pencils and erasers, we need additional information from the question that is not provided in the given reference material. A precise answer cannot be given without knowing either the number of erasers Sam already has or a specific relationship between the number of pencils and erasers that he intends to buy.
However, the provided answer options (A: 6, B: 9, C: 12, D: 15) suggest that there may have been an additional context in the original question that has not been included in the reference snippets shown. To proceed correctly, it would be necessary to have complete information about the problem. As such, without this information, we cannot accurately determine the minimum number of pencils Sam needs to purchase.