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The original employees hired, who had been there over twenty years, were fiercely loyal to the firm, and it offered no retirement benefits or profit sharing to any employees.
(A) and it offered no
(C) still it offered no
(D) though it offered no
I think "still" will better suit the context here. Because the sentence says, Employees were loyal to company for so many years, (still) when these employees were not offered any retirement benefits.
Use of "Though" sounds awkward to the said context.