Final answer:
The correct answer is C. An average of 18 percent of the television households in the country were tuned to Master Quiz.
Step-by-step explanation:
The correct answer is C. An average of 18 percent of the television households in the country were tuned to Master Quiz.
When we say that the average national program rating of Master Quiz was 18, it means that 18 percent of the television households in the country were watching the show.
This is a measure of the popularity of the show among households with televisions.
Option A is incorrect because it mentions 18 million households watching, but the question does not provide any information about the total number of households watching.
Option B is incorrect because it mentions 18 percent of households watching television, but the question does not provide any information about the percentage of households watching television.
Option D is incorrect because it mentions 18 million households watching for at least five minutes, but the question does not provide any information about the duration of time households watched the show.
Option E is incorrect because it mentions 18 percent of households in the United States watching the entire program, but the question does not provide any information about the percentage of households watching the entire program.