A research report includes this paragraph: "we hypothesized that anxiety disorders are more frequent in children whose parents are divorced. we looked at the frequency of anxiety problems in divorced and intact families, using court records to determine when the divorce took place." what component of scientific research is missing in this paragraph?
a. there is no reliable way of determining timing of divorce.
b. there is no clearly stated hypothesis.
c. there is no operational definition of anxiety disorder.
d. there is no examination of base rates.