Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.

ORGANS, SORGAN, SNORGA, ?, SNAGOR, SNAGRO

SNAORG

Each term is formed by shifting each letter to the left, and the first letter is moved to the end.

ORGANS

SORGAN (Shift each letter to the left, move the first letter to the end)

SNORGA (Shift each letter to the left, move the first letter to the end)

ASNOGR (Shift each letter to the left, move the first letter to the end)

RASNOG (Shift each letter to the left, move the first letter to the end)

OGRASN (Shift each letter to the left, move the first letter to the end)

Among the provided options:

SNAOGR replaces the question mark