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". So the correct option in regards to the given question is option "d". The main reason behind it is that United States and Britain share a common language, common laws, similar heritage, mutual dependence on open trades and similar types of businesses. These similarities have made them very close allies. They are dependent on each other militarily as well. The sync between the two nations are mainly based on military alliance and trading.

"teotihuacan was the cultural center of the zapotecs".