Answer:
Altruist or selfish.
Explanation:
( A) cooperative or altruistic is not the correct answer because cooperative means work in group for a goal that will benefit all members,
(B) Spite or selfish reffers to bad actios but there is not evidence of bad intentions.
(C) Altruistic or spiteful basically deals with good actions against the bad ones, but any of the young scientist showed suspicious behabviour.
The correct answer is D; this style of interaction occurs when two or more people share their ideas without any second intention, and only one of them is the benefited, nevertheless when the benefited one does not give any credit to the other it becomes into a selfish act.