Which of the following is a correct pair of singular and plural?

Tooth:Teeth

The correct pair of singular and plural is:

☀ Tooth:Teeth

Explanation for each option:

☀ Mice:Mices: This is incorrect. The correct plural form of "Mouse" is "Mice."

☀ Storey:Stories: This is incorrect. The correct plural form of "Storey" is "Storeys" (or "Stories" in some regions).

☀ Tooth:Teeth: This is correct. The singular form of "Tooth" is "Tooth," and the plural form is "Teeth."

☀ Echo:Echos: This is incorrect. The correct plural form of "Echo" is "Echoes."