Answer:
D) ommiting
Explanation:
The form of the word "omit" is misspelled in the progressive or continuous form (verb in the "ing" form) in the choices given. It should be spelled as "omitting" which is double "t" and single "m" just like the the past form "omitted." The word has only one "m" in the root word "omit"; hence, it should have single "m."
