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Part of the proposed increase in state education spending is due to higher enrollment, since the number of students in public schools have grown steadily since the mid-1980's, and at nearly 47 million, are at a record high.

A) enrollment, since the number of students in public schools have grown steadily since the mid-1980's, and at nearly 47 million, are at
B) enrollment, with a number of students in public schools growing steadily since the mid-1980's and, at nearly 47 million, reaching
C) enrollment: since students in public schools have grown steadily in number since the mid-1980's and, at nearly 47 million, have reached
D) enrollment: the number of students in public schools has grown steadily since the mid-1980's and, at nearly 47 million, has reached
E) enrollment: students in public schools have grown steadily in number since the mid-1980's and, at nearly 47 million, are at

OA is D