Answer:
examples 1 and 2 are examples of frustration
example 3 is an example of sympathy and greif
example 4 is an example of anger
contracting is the correct answer!
By he NIH trying a new drug to help reduce pain associated with sickle-cell anemia, it's an example of an "experiment".
An experiment involves a hypothesis (an educated guess as to what's going to happen) and trying out the hypothesis and finding the solution.