Sentence Correction

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
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Quoting Ron from the discussion on MGMAT (4th Last Post)

in general, there are two correct uses of "comma -ing" after a clause:
(1) to describe a direct and immediate consequence of the action in the clause;
ray scored a perfect 100 on his most recent exam, bringing his average for the semester up to 93.
OR
(2) to describe an action that is simultaneous with and subordinate to the action in the preceding clause.
ray ran down the sidewalk, flailing his arms.

Ron , You eliminated A because outnumbering can not be deemed an effect of the

period beginning a few
years before Susan's marriage to Emily's brother and
ending shortly before Emily's death in 1886,

But the main verb in A is "were written " so cant we say that outnumbering in (A) describes an action that is simultaneous with and subordinate to the action in the preceding clause and is similar to the 2nd example you gave in the quoted portion .