Final answer:
The abbreviation for the customary voice ranges in a choir, according to the options provided, is SSA, which stands for Soprano 1, Soprano 2, and Alto, represented by the fourth option.
Step-by-step explanation:
The abbreviation for the customary voice ranges found in a choir or chorus is SSA, which stands for Soprano 1, Soprano 2, and Alto, the three most common female voice parts. The correct answer to the listed options is number 4 (SSA).
Choirs typically divide voice ranges into several categories to create harmonies and balance within the ensemble. For male vocalists, the divisions are similar to those mentioned by The New York Choral Society: Tenor, Baritone, and Bass. For mixed choirs, all four voice parts (Soprano, Alto, Tenor, Bass) are commonly abbreviated as SATB.