All of the Following Are Examples of a Particular Stage

All of the following are examples of a particular stage of rifting EXCEPT:

A) the Great Rift valley of East Africa, which may be a failed arm of a three- branched rift.
B) the Red Sea, which is an active arm of continuing divergence.
C) the Rio Grande region of Colorado and New Mexico, which is an area of initial crustal stretching and thinning.
D) the northeast coast of the United States, which shows evidence of future rifting.