The values expressed in X place her within Y, ________ her interest in Z.
(A) The values expressed in X place her within Y,
as does her interest in Z.
As does connects Z with X within Y with the conjunction
as.
Does is the singular form of
do connecting with the singular
interest. Seems fine
(B) The values expressed in X place her within Y,
so do her interest in Z.
Do is plural but
interest is plural. (x)
(C) The values expressed in X place her within Y,
as do her interest in Z.
Do is plural but
interest is plural. (x)
(D) The values expressed in X place her within Y,
so is the case with her interest in Z.
Like A, this groups X with Z, but it feels wrong. Can 'case with' be used in formal English?
(E) The values expressed in X place her within Y,
similarly, does her interest in Z.
The values expressed in X place her within Y is an independent clause (it can stand alone as a sentence).
Similarly is an adverb and it can start a new sentence, but (I believe) it cannot act as a conjunction like in the passage above
e.g. Mary is studying grammar. Similarly, John..., or
Mary is studying grammar; similarly, John..., not
Mary is studying grammar, similarly, John... nor
Mary is studying grammar, similarly John....