Although modern science has essentially eradicated the

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

A. the occasional patient should be diagonsed every few years with the disease -- should be... few years with the disease -- POE.
B. an occasional patient should be diagonsed with the disease once in every few years -- once in few years, should be POE.

C. the disease will be diagonsed in the occasional patient once in every few years -- the disease will be diagnosed --wrong usage. POE.
D. every few years the occasional patient will be diagonsed with the disease -- correct usage of will be and every few years.
E. every few years the occasional patient should be diagonsed with the disease -- should be ..POE.













______________________________________________________________________
I understand the answer, but the question I have here is if we should use "if the occasional patient will be diagonsed" rather than use "the disease will be diagonsed"?
Thanks.