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Choose which sentence uses commas incorrectly with a coordinating conjunction.

There is a lot of traffic on our route, so we decided to look into alternative ways of getting there.

Emily wanted to research Chinese infrastructure for her argument paper, but she was having a hard time narrowing it down any further.

We wanted to invite Paula, and Lucca to the party even though they had told us they were nervous about attending.

Josiah decided to go to the store, so he asked his mother if she needed anything from there before he left.