It was a girl from my town who achieved a silver medal. How is this best expressed?

The first choice, which states "It was a girl from my town," directly conveys the intended meaning of the original statement without altering its context or focus. This option preserves the specific detail that the girl is from the town, emphasizing her local connection while clearly identifying her as the one who achieved the silver medal. It maintains a straightforward and clear communication of the facts.

The other options, while potentially grammatically correct, introduce unnecessary ambiguity or change the emphasis of the sentence. They lack the specific reference to the town, and in doing so, fail to capture the same meaning as the original sentence. Therefore, the first choice stands out as the most accurate representation of the idea expressed in the original statement.