Final answer:
None of the above-mentioned country performers hosted an important country music TV show in the 1960s.
Step-by-step explanation:
The correct answer to the question is None of the above. None of the country performers mentioned in the options, Johnny Cash, Willie Nelson, or Brad Paisley, hosted an important country music TV show in the 1960s. The question implies that there was a country music TV show hosted by a country performer in the 1960s, but none of the options provided fit that description.