Consider the following scenario: Randy and Ray want to test their theory that being older (X) causes people to have more political knowledge (Y). They assert this is likely to be the case because older people are likely to have had more political experiences. They collect some survey data and find that age is positively correlated with a scale for political knowledge. Which of the following causal hurdle scorecards most accurately reflects the state of this research project?a. (y y y n)b. (y y y y)c. (y n y n)d. (n y y n)