Continuing education opportunities allow adults to
a. improve on their skills
b. complete their education
c. change careers
d. all of the above

Continuing education opportunities allows adults to D. all of the above. If they continue educating themselves, by attending a college if they hadn't done so when they were younger, adults will have the opportunity to improve on their skills, by learning new ones, complete their education if they hadn't done so already, and change careers, should they wish to do so.

The answer is price.

Ithink the answer you are looking for is (b).