Answer:
D. Confirmatory hypothesis testing
Step-by-step explanation:
Confirmatory hypothesis testing can be referred to as, seeking and remembering information that can confirm, but not refute, a hypothesis.
It refers to the kind of statistical analysis where hypotheses that were properly deducted from a theory are confirmed
By confirmatory hypothesis testing researches mean the situation in which they had identified a specific set of theory-critical hypotheses in advance and they are now attempting to measure the evidence for or against them as accurately as possible.
That is what Dr Friedman is doing.