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.

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:

"Criteria" is the irregular plural form for the word "criterion", which means a principle, benchmark or standard by which something is judged. "Criterion" is a Greek word, which is why it has this irregular plural. Another Greek word that has the same -on ending and uses the same -a plural is "phenomenon"/"phenomena". With that in mind, we can safely choose letter A as the correct option.

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