Answer:
Tarrant
Step-by-step explanation:
The most Republican-leaning large county in America is TARRANT
This is assertion is based on the historical records in terms of voting patterns. It has been observed that even as some other conservative counties have been leaning towards Democrats, Tarrant, an urban county in Texas, is the only county that hasn’t backed a Democratic presidential candidate in the past decade.
Hence, in this case, the correct answer is TARRANT