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

The correct answer is Option (4) → Monarch:Monarchs

The correct pair of singular and plural is:

☀ Monarch:Monarchs

Explanation for each option:

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

☀ Hair:Hairs: This is incorrect. The correct plural form of "Hair" is "Hairs" when referring to individual strands of hair. However, when referring to hair collectively, the word "Hair" can be both singular and plural.

☀ Stomach:Stomaches: This is incorrect. The correct plural form of "Stomach" is "Stomachs."

☀ Monarch:Monarchs: This is correct. The singular form of "Monarch" is "Monarch," and the plural form is "Monarchs."