Commonwealths . A. only have ceremonial ties to their mother country
B. are involuntarily linked to a mother country
C. are not dependent upon their mother countries after gaining independence
D. are dependent upon their mother countries for defense and foreign policy issues

Commonwealths are dependent upon their mother countries for defense and foreign policy issues.

Explanation:

A is not correct because the commonwealths have complex relations with their mother country, and even though they are governing themselves, they still are heavily dependent on certain things from their mother country.

B is not correct because these territories are voluntarily linked to the mother country, and the main reason is that they are still in some part dependent on it.

C is not correct because the majority of these territories are dependent on their mother countries, some for defense, some financially, some for disputes...

D is correct because pretty much all of these territories are dependent on defense and foreign policy issues on their mother countries, despite often being able to sustain themselves economically and socially.