Older United States automobiles have been identified as contributing disproportionately to global air pollution. The ...

j.k.e12 February 27, 2022

B is an incomplete answer

I think B is missing part of the answer. It ends with "than incomplete" and not in a period like the other answer choices.

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Emil-Kunkin March 3, 2022

Good catch, the rest of the answer should read "than older automobiles do now"