Patient diabetic, upper #5 have amalgam MOD, and have mobility grade II, calculus quit, and want to make artificial for missing tooth

Patient diabetic, upper #5 have amalgam MOD, and have mobility grade II, calculus quit, and want to make artificial for missing tooth:

a. FPD with tooth supported

B. extraction and make RPD ******

C. make occlusal rest and make RPD

D. remove it and make implant

E. resin bounded tooth supported