What is the singular version of criteria, and why is it irregular? a.
criterion is the singular version, and it is irregular because it is a greek word in which the –on is changed to –a in its plural form.
b.
criteris is the singular version, and it is irregular because it is a greek word in which the –is is changed to –a in its plural form.
c.
criterium is the singular version, and it is irregular because it is a greek word in which the –um is changed to –a in its plural form.
d.
criterion is the singular version, and it is irregular because it is a latin word in which the –on is changed to –a in its plural form.

The correct answer is A. Criterion is the singular version, and it is irregular because it is a Greek word in which the –on is changed to –a in its plural form.

Explanation:

Irregular nouns are those nouns that do not follow the grammatical plural formation rules of adding -s or -es at the end of the word to make it plural, instead, in the case of irregular nouns, the plural is formed by changing other letters in the singular form. Additionally, some of the nouns are irregular because they derive from other languages such as Greek or Latin and because of this they do not follow the convention of English. This is the case of the word "criterion" that means a standard or rule use to judge something, whose plural form is "criteria" and can be explained as both words derive from Ancient Greek in which the letter "-on" used to be replaced by "-a" to create the plural form. Therefore it can be concluded in this case, the singular version of the word criteria is "Criterion" because this word derives from Greek in which the -on is changed to -a to create the plural form.

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