Which type of male voice lies between bass and tenor?

The baritone voice type is indeed positioned between bass and tenor in terms of vocal range. Baritones typically have a rich, warm tone and can comfortably sing notes that are lower than those of tenors but higher than those of basses. This middle range allows baritones to play a variety of roles in both operatic and choral music, making it a versatile and integral part of vocal ensembles.

In contrast, the other voice types listed do not fit in this classification. The alto is a female voice that sits below the soprano, and the countertenor is a male voice that sings in the alto range, often using falsetto to achieve higher notes. The tenor is a higher male voice that exceeds the range of a baritone. Thus, the baritone is the only voice type among the choices that directly lies between bass and tenor, making it the correct answer.