Match the type of variable in List I with its basic feature in List II and choose the correct answer from the options given below:

Independent variable matches predictor variable, dependent variable matches outcome variable, and intervening variable tells the relationship between two variables.

The independent variable is the cause the researcher manipulates, so it predicts the outcome and is the predictor variable.

The dependent variable is the effect that is measured, making it the outcome variable.

The intervening variable is a hypothetical inner link that explains the relationship between the independent and dependent variables.

Independent and dependent variables are observable, whereas the intervening variable is inferred, not directly measured.

A related type is the extraneous variable, an unwanted influence that must be controlled to protect internal validity.