Answer:
The correct answer is The study has a problem with the External validity
Explanation:
External validity in research terms is the validity the research has in the outside world or in the applied social reality of the field of study, it is the extent in which the results and conclusions of the study can be applied and generalized to ohter external factors, therefore in this case, when the researchers did the experiment only with motivated volunteers did not take into account that people outside may not have the same motivation, therefore the results may not be the same in the external social reality and thus having problems with the external validity.
Hard Rock believes that music
is energy which can positively influence the world. Music builds bridges it
inspires people. With that philosophy in mind Hard Rock and its Hard Rock Heals
Foundation organizes charitable concerts and all of the revenue goes to back to
the communities. Hard Rock also donates to charities and has around 30 grants
awarded to music driven programs.
This specification is known as arbitration and is a part of the fair resolution process. If both parties agree, then the case can be taken to a different court that is not part of the national court system of the parties. Example can be going to the international court of justice in Strasbourg if you feel that your human rights were violated.
Sometimes they have better opportunities
