Choose the plural noun that's spelled correctly? A. Fathers-in-law B. Phenomenons C. Pianoes D. Editor in chiefs

The plural noun that is spelled correctly is A. Fathers-in-law.

To determine which plural noun is spelled correctly, we can break down and analyze each option:

A. Fathers-in-law: This is the correct plural form of the noun "father-in-law." It follows the pattern of forming plurals by adding an "-s" to the noun.

B. Phenomenons: This plural form is incorrect. The correct plural of "phenomenon" is "phenomena." The "-a" ending is used instead of "-on" in the singular form.

C. Pianoes: This plural form is incorrect. The correct plural of "piano" is "pianos." No additional "e" is added in the plural form.

D. Editor in chiefs: This plural form is incorrect. The correct plural form of "editor in chief" is "editors in chief." Both "editors" and "chiefs" are made plural by adding "-s" to the end.

Therefore, the correct plural noun spelled correctly is option A: Fathers-in-law.