1. Chuck was upset when only a few people responded to his invite. 2. With only a few people responding to his invite, Chuck was upset. 3. Because only a few people responding to his invite was why Chuck was upset.
Order the sentences from best to worst.
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When you start a clause with "with", it modifies the subject directly following the comma. "But a few people responding..." doesn't describe Chuck. The last sentence has multiple errors: "because" and "was why" are redundant. "Responding" should be "responded", though the noun phrase it is a part of is really long and awkward.