Which sentence is a run-on sentence ?

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My neighbors cat strolls our backyard everyday, but i'm not sure why.

Because his electricity bill perplexed him, Mr. Arnold scratched the top of his head. (i chose this one and quia marked it wrong.)

The city plans to build new tennis courts at the park many athletes will be happy.

May 19th, 2015

The city plans to build new tennis courts at the park many athletes will be happy.

This is a run-on sentence because there should be a period after the word park.

May 19th, 2015

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May 19th, 2015
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May 19th, 2015
Sep 24th, 2017
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