Final answer:
The recommended treatment option for a pulp that cannot heal is a root canal.
Step-by-step explanation:
When the pulp displays symptoms of lingering pain and the clinical diagnostic findings show that the pulp is incapable of healing, the recommended treatment option is a root canal. A root canal involves removing the infected tissues from the pulp and sealing the root canal to prevent further infection. This treatment helps alleviate pain and prevent the spread of infection to other tissues.