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Yes, it made all the sense to me now.
Hello
TheGraceful,
We hope this finds you well.
To answer your query, Option A alters the meaning of the sentence through the use of the clauses "and these families can no longer qualify" and "rising rental rates force them...housing"; the use of "and" incorrectly implies that middle-income families are especially hard-hit, and
as a separate action these families can no longer qualify to buy homes, and
as a separate action rising rental rates force them to use far more than the standard 25 percent of their incomes for housing; the intended meaning is that middle-income families are especially hard-hit
because these families can no longer qualify to buy homes,
but rising rental rates force them to use far more than the standard 25 percent of their incomes for housing.
We hope this helps.
All the best!
Experts' Global Team