Clara, at Age 47, Decided to Adopt a Child on Her

Clara, at age 47, decided to adopt a child on her own because she tired of waiting around for "Mr. Right" to come along. She decided to move on with her life. Clara is an example of a(n) :

A) propinquity single.
B) voluntary stable single.
C) involuntary temporary single.
D) involuntary stable single.
E) pool of eligibles single.