Patient complains of pain and minor ulcers around the neck area of the abutments and on the free saddle area.. Insufficient relief on the denture base

RPD photo with the metal Framework. Abutment 23, 11 and 13. Patient complains of pain and minor ulcers around the neck area of the abutments and on the free saddle area. When patient removes it, it gives her relief. What is he cause?

A. Insufficient relief on the denture base. ***

B. retentive clasp is not rigid

C. design without stress breakers.