Which of the following singular nouns does not form an irregular plural?

Question

A. ox
B. tooth
C. mouse
D. tree

I thought it was A but i got it incorrect If i had to guess i would say b. but i really need to get this answer right. please help):

Answer 1

For heaven's sakes, Jocelyn, look up each of these words to see their plurals.

Also -- apparently you don't know what an irregular plural is.

Answer 2

well that was rude

Answer 3

And its Jocelynn Ms. Su

Answer 4

From Google definitions:

"rude
ro͞od/Submit
adjective
1.
offensively impolite or ill-mannered.
"she had been rude to her boss"
synonyms: ill-mannered, bad-mannered, impolite, discourteous, uncivil, ill-behaved, unmannerly, mannerless;"

Answer 5

woooo Google