Answer:
Congress's commerce authority includes the power to regulate those activities having a substantial relation to interstate commerce (activities that substantially affect interstate commerce).
Explanation:
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Ems telegram was of particular importance because it <span>started the Franco-Prussian War. The correct option among all the options that are given in the question is the third option or option "c". The other choices can be neglected. I hope that this is the answer that has actually come to your desired help.</span>