Psychologists have just completed an extensive study of recently divorced parents in order to determine which factors contributed most to the dissolution of the marriage. The researchers found that in a great majority of the cases of failed marriages, the couples ate, on average, fewer than ten meals per week with each other. From this data, the psychologists have determined that a failure to spend time together during meal times is a major factor leading to divorce.
Which of the following, if true, would cast the most doubt on the researchers’ hypothesis?
A.Many couples who have long and successful marriages eat together fewer than ten times per week.
B. In many cases, people in unhappy marriages tend to express their displeasure by avoiding contact with their partners when possible.
I know B is correct because B shows that researchers reverse cause and effect. But why A is not correct, please help!