Though no longer a series of colonies, the united states retains close ties to britain as
a. a commonwealth
b. a dependency
c. a dominion
d. part of a “special relationship”

Though no longer a series of colonies, the United States retains close ties to Britain as part of a "special relationship". The correct option in regards to all the options given in the question is option "D". There are several factors like mutual dependence, similar laws, open trade market, common type of heritage and common language are some of the factors that have helped in creating this “special relationship”. The military closeness is another huge factor contributing in this direction.