A New Personality Test Claims to Measure How Much Two

A new personality test claims to measure how much two people love each other. How could you measure the reliability of the test?

A) Have couples take the test repeatedly and see whether they keep getting the same score.
B) Determine whether couples who score high on the test are more likely than others to stay married for at least 10 years.
C) Give the test to a large random sample of people and calculate the mean and the standard deviation.
D) Ask a random sample of people whether the items on the test refer to the same thing they mean when they talk about love.