Sentence Correction

Although modern science has essentially eradicated the bubonic plague from the industrialized word, the occasional patient should be diagnosed every few years with the disease.

A. the occasional patient should be diagnosed every few years with the disease
B. an occasional patient should be diagnosed with the disease once in every few years
C. the disease will be diagnosed in the occasional patient once in every few years
D. every few years the occasional patient will be diagnosed with the disease
E. every few years the occasional patient should be diagnosed with the disease
OA E
I mentioned the OA
Could an Instructor please help me understand why is D wrong ?

mundasingh123 wrote:Although modern science has essentially eradicated the bubonic plague from the industrialized word, the occasional patient should be diagnosed every few years with the disease.

A. the occasional patient should be diagnosed every few years with the disease
B. an occasional patient should be diagnosed with the disease once in every few years
C. the disease will be diagnosed in the occasional patient once in every few years
D. every few years the occasional patient will be diagnosed with the disease
E. every few years the occasional patient should be diagnosed with the disease
OA E

Could an Instructor please help me understand why is D wrong ?

This is no instructor!!! But I'll try.
D changes the intent of original sentence by using will(certain) instead of should (uncertain)

mundasingh123 wrote:Although modern science has essentially eradicated the bubonic plague from the industrialized word, the occasional patient should be diagnosed every few years with the disease.

A. the occasional patient should be diagnosed every few years with the disease
B. an occasional patient should be diagnosed with the disease once in every few years
C. the disease will be diagnosed in the occasional patient once in every few years
D. every few years the occasional patient will be diagnosed with the disease
E. every few years the occasional patient should be diagnosed with the disease
OA E

Could an Instructor please help me understand why is D wrong ?

Yup in option D usage of will is wrong because the first part of the sentence says that modern science has essentially eradicated,therefore, we require a bossy verb should.........

Please hide OA using the spoiler answer. An answer on the plate doesn't help us figure the question out.

Thanks

EDIT

For the Benefit of the Rest , I have spoiled the OA