Where once the union had

[singmah1]

Where once the union had acquiesced to the prejudices of its English-speaking members by supporting the imposition of an alien tax on immigrant workers, after 1897 the United Mine Workers made a determined effort to enlist Italians and Slavs in its ranks.
(A) Where once the union had acquiesced to the prejudices of its English-speaking members by supporting
(B) Where once the union acquiesced to it English-speaking members’ prejudice for the support of
(C) While once the union had acquiesced to the prejudices of its English-speaking members in support of
(D) While once the union acquiesced to its English-speaking members’ prejudice in supporting
(E) While once the union had acquiesced to the prejudices of its English-speaking members in its supporting of

[DJValentino]

will go for C.

[YankeeMusk]

what is Official Answer ?

[modusoperandi]

Like A

[tablesalt]

For C too.

[Orange08]

C looks good.

[iamproxied]

will go with A. whats the Official Answer?

[meghago]

imho A.
in GMAT where beats while mostly (Erin's Mantra).
B has a problem with 'it.'

[DJValentino]

can we get the Official Answer please?

[celesking]

Do we really need 'had acquiesced' or acquiesced is good enough? I'd go with D instead. What is the OA (Where once the union had) ?