A Psychology Professor Wants to Measure "Parent Aggressiveness

A psychology professor wants to measure "parent aggressiveness." Which is the BEST strategy?

A) Visit each home and chart how often parents hit their children.
B) Develop a questionnaire asking parents,"How often do you hit your children?"
C) Go down the street and ask neighbors,"Does the parent hit the children a lot?"
D) No approach is ideal,because each has its own problems and biases.