Margaret Courtney-Clarke

Margaret Courtney-Clarke has traveled to remote dwellings in the Transvaal to photograph the art of Ndebele women, whose murals are brilliantly colored, their geometrical symmetries embellished with old and new iconography and in a style that varies from woman to woman and house to house.
(A) whose murals are brilliantly colored, their geometrical symmetries embellished with old and new iconography and in a style that varies from woman to woman and house to house
(B) whose murals are brilliantly colored, their geometrical symmetries are embellished with old and new iconography, and their style is varying among women and houses
(C) whose murals are brilliantly colored, their geometrical symmetries are embellished with old and new iconography, and they are in styles that vary from woman to woman and house to house
(D) with murals brilliantly colored, their geometrical symmetries embellished with old and new iconography, and their style varies among women and houses
(E) with murals that are brilliantly colored, their geometrical symmetries embellished with old and new iconography, and their styles vary among women and houses

[spoiler]OA:A[/spoiler]
I have question regarding A, last modifier is
'their geometrical symmetries embellished with old and new iconography and in a style that varies from woman to woman and house to house '

A and B + that verb --- Can the verb be singular (referring only to B) or plural (referring to A and B)??

1. On the stage are professsor Y and X who won his nobel prize last year
-- I think this sentence is incorrect as who refers to Y and X so we need plural noun

2. On the stage are professsor Y along with X who won his nobel prize last year
-- I think this is correct as no 'and ' , therefore who refers only to X

3. On the stage is professsor X who won his nobel prize last year, and Y
-- this is correct

4. On the stage is professsor Y and is professsor X who won his nobel prize last year
--Would this sentence be correct

If each of the above sentece has , who instead of who - would the sentence mean the same as the original choices above (1,2,3,4)
5. On the stage are professsor Y and X, who won his nobel prize last year
6. On the stage are professsor Y along with X, who won his nobel prize last year
7. On the stage is professsor X ,who won his nobel prize last year, and Y
8. On the stage is professsor Y and is professsor X, who won his nobel prize last year

In Option A: it looks like varies refers to style
Had it been 'vary' would it still be right (as in that case it would modify both ' with old and new iconography and in a style') or will the presence of preposition 'in a style' make 'that' refer only to 'style'

Experts please advice

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