Answer:
The correct option is D) Peer review
Step-by-step explanation:
Peer review can be described as an evaluation made for somebody's work by the people of equal calibre. Peer review is very important in scientific researches as it depicts the validity of work done by other people.
In the above-mentioned scenario, the work of Dr. Bob is being evaluated by scientists who have equal calibre like Dr. Bob. Hence, the results by other members of the scientific community would be considered as peer review on Dr. Bob's work.