Sentence Correction

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 47million, are at

mgmt_gmat wrote: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 47million, are at

MY PICK IS C

i'm confused with this one because i'm not sure where exactly the end of the underlined section would be... there are periods at the end of all of the statements except for the last one.