Please check my answer tahnks :)

Question

Choose the plural noun that is spelled correctly.

Phenomenons pianoes

Father-in-laws Editors in cheif

I picked Phenomenons

Answer 1

Then what is the word "phenomena" ?

Answer 2

Bob Pursley is right. The answer is non "phenomenons" (phenomenon=s.; phenomena=pl.)

Which other one did you decide on?

??

Answer 3

If you had spelled chief correctly, the last word combination would be the only correct plural. As written, there is something wrong with all of them.

Answer 4

Thanks :)