Which word or abbreviation in the sentence, if any, should be followed by a comma?

mr. alex jackson, ceo founded the company 10 years ago.

a.
ceo

b.
mr.

c.
there is no error in comma usage.

d.
founded

Context clues can be definitions, examples, synonyms, or antonyms. the word root can give you an idea of the word’s meaning. affixes can you determine the word’s form and meaning. use the drop-down menus to identify the root in each difficult word. automatic: gratify: untenable: