Respuesta :
Answer:
B. They have Latin origins and therefore have irregular plural forms.
Explanation:
Nouns that end in -um are loan words from Latin. These nouns were neuter in gender and formed the plural form in their language by changing the ending -um to -a. That's what we still see in some English words borrowed from Latin.
datum - data
bacterium - bacteria
stadium - can be both stadiums and stadia
Answer:B. They have Latin origins and therefore have irregular plural forms.