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 ?