Which range represents the alto part in four-part harmony?

The alto voice in four-part harmony typically falls within a specific vocal range that complements the soprano, tenor, and bass parts. In this context, the correct range for the alto part is from F3 to D5. This range allows altos to sing harmonies that are higher than the tenor parts but lower than the soprano parts, providing a rich, balanced sound in choral settings.

Altos are often responsible for creating inner harmonies, and their range can encompass both melodic and harmonic lines within a composition. The range from F3 to D5 is consistent with standard choral practices and aligns well with the physical capabilities of most alto singers.

In contrast, the other options either fall too low or too high to accurately represent the alto range in traditional four-part harmony. Understanding vocal ranges is crucial for effective choral arrangement and performance, ensuring that each part is well-suited to the singers' abilities.