The claim from the speech best supports Warren's argument that the fight against pay inequality has begun "For middle-class families today, it usually takes two incomes to get by, Thus, option "D" is the correct.
Senator Warren stands victorious in successfully presenting the long-lasting effects brought in by wage discrimination by offering sufficient evidence to validate his claim.
She substantiates her claim by indicating the factual consequences associated with the pay inequality by stating that 'Pay inequality also means a tougher retirement for women.' He also says that 'unequal pay makes it harder for them to pay back student loans' which implies that their future becomes difficult(as another long-term effect of unequal pay). Warren's evidence not only authenticates her claim but also convinces the readers to pay attention and believe in the author's concern towards the serious problem of such wage discrimination.
Thus, option "D" is correct.
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