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C

Step-by-step explanation:

Within the sentence, it explicitly states "the war was a vehicle for lasting social and economic gains." In other words, the war led to a better future in terms of social and economic gains for discriminated groups (discriminated groups were mentioned in the beginning of the sentence which gives us the who). Some may argue D is correct, but I strongly side with C instead because D emphasizes discrimination ended, while the sentence makes no such claim. The sentence only states discriminatory issues were improved, but still not completely absent. As for A, there is no mention of technology in the sentence. In terms of B, the sentence refers to the "gains" or improvement of discrimination and not the "plague" or worsening of discrimination. Hence, C fits best.

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