Final answer:
Joanna would most likely be diagnosed with c. primary anorgasmia, which means she has never experienced an orgasm despite being sexually active for many years.
Step-by-step explanation:
Anorgasmia refers to the inability to achieve orgasm, and primary anorgasmia specifically refers to individuals who have never experienced an orgasm despite sexual activity. It is important to note that anorgasmia can have various causes, including physical, psychological, or relational factors. In Joanna's case, despite being sexually active for many years, the fact that she has never experienced an orgasm suggests she may have primary anorgasmia. Joanna would most likely be diagnosed with primary anorgasmia.