Emily Dickinson’s letters to Susan Huntington Dickinson were written over a period beginning a few years before Susan’s marriage to Emily’s brother and ending shortly before Emily’s death in 1886, outnumbering her letters to anyone else.
A. Dickinson were written over a period beginning a few years before Susan’s marriage to Emily’s brother and ending shortly before Emily’s death in 1886, outnumbering
B. Dickinson were written over a period that begins a few years before Susan’s marriage to Emily’s brother and ended shortly before Emily’s death in 1886, outnumber
C. Dickinson, written over a period beginning a few years before Susan’s marriage to Emily’s brother and that ends shortly before Emily’s death in 1886 and outnumbering
D. Dickinson, which were written over a period beginning a few years before Susan’s marriage to Emily’s brother, ending shortly before Emily’s death in 1886, and outnumbering
E. Dickinson, which were written over a period beginning a few years before Susan’s marriage to Emily’s brother and ending shortly before Emily’s death in 1886, outnumber
The OA is E.
I just wonder why A is not correct. Choice E has changed the structure and emphasis of the original sentence("were written" should be the main verb in the main sentence, not in the subordinate sentence). Besides, the sentence describes the past circumstance/tense ("were written") and in choice E, "outnumber" expresses the present tense.
In choice A, "outnumbering" can be considered as a consequence or accompanying circumstance, because the letters were written over the long period (beginning...and ending...), and then the number of this kind of letters has increased and even exceeded the number of "her letters to anyone else".
Could you help me to explain that and point out my misunderstanding about this problem, if there is any?
Thanks a lot!