All of the following plural nouns except

a.flies
b.themselves.
c. ladys.
d.proofs
I am think d

All of the following compound nouns are correct except
a.editors in chief.
b.sons-in-law.
c.bird watchers.
d.mother-in-laws.
I am think b or d

Neither answer is correct.

for which one

All of your answers are wrong.

The first one is c

Yes. The first is c.

To determine the correct answer, let's evaluate each option individually.

For the first question: "All of the following plural nouns except..."

a. flies - This is a correct plural form of the noun "fly." It refers to more than one fly.

b. themselves - This is a reflexive pronoun and does not function as a plural noun.

c. ladys - This is an incorrect plural form of the noun "lady." The correct plural form is "ladies."

d. proofs - This is a correct plural form of the noun "proof." It refers to more than one proof.

Considering the options, the incorrect plural noun is "c. ladys" because it should be "ladies." Therefore, your assumption that option "d. proofs" is correct is incorrect.

Moving on to the second question: "All of the following compound nouns are correct except..."

a. editors in chief - This is a correct compound noun, referring to the top editors.

b. sons-in-law - This is also a correct compound noun, referring to plural sons of a person's spouse.

c. bird watchers - This is a correct compound noun, referring to people who observe or study birds.

d. mother-in-laws - This is an incorrect plural form of the compound noun "mother-in-law." The plural form should be "mothers-in-law."

Considering the options, the incorrect compound noun is "d. mother-in-laws" because it should be "mothers-in-law." Therefore, your assumption that option "b. sons-in-law" is incorrect is incorrect.

In conclusion, based on the information provided, the correct answers are:
- The incorrect plural noun is "c. ladys" because it should be "ladies."
- The incorrect compound noun is "d. mother-in-laws" because it should be "mothers-in-law."