The northernmost city in Texas is Amarillo city located on the high plains of northern Texas, U.S.
<h3>What is Texas?</h3>
Texas refers to the state in the south-central region of the United States.
Amarillo is located near the middle of the Texas Panhandle and is part of the Llano region. Amarillo city of potter country, on the high plains of northern Texas, U.S.
Therefore, C is the correct option.
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