Some nouns that end in -um are made plural by changing the –um to –a. which of the following best explains this change?
a. they have greek origins and therefore have irregular plural forms.
b. they have latin origins and therefore have irregular plural forms.
c. they have spanish origins and therefore have irregular plural forms.
d. there are no words that change forms like that in english.

select the best answer from the choices provided

B. They have Latin origins and therefore have irregular plural forms.

Explanation:

There are relatively few words in English ending in -um, because most of those words come from Latin, and Latin wasn't a big contributor to English language as it was to other languages (like French and Spanish, that's why they are called Latin languages). The English -um words are mostly scientific terms.

But for example you have 'datum' (the singular form of 'data') and 'diverticulum' (which does become 'diverticula' in plural form).

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