The correct answer is c) Laws, customs, and norms in the area in which the research has to be conducted.

Explanation:

It is the age when a person has a right to perform different acts prescribed by the state laws and statutes. It may vary from state to state by in general it starts at 18.

To make things simple, the age of majority is a turning point for an individual when he or she gets specific rights to perform different actions. In other words, a person has full control over his or her dids, preferences, beliefs, etc. Starting from this age, a person takes the full responsibility of acting following the law and readiness to take punishment in case of violation.

Some mistakenly consider the age of majority a time when one has a right to consume alcohol or obtain a driving license. This statement is wrong. In some states, people can buy alcoholic drinks and take responsibility for law violations at different ages. It all depends on the state legislation and regulations.

While the age can be different from country to country, this fact creates some obstacles when it comes to conducting international research. On the other hand, a simple solution is to keep up with regional laws depending on the country one is exploring. In other words, single research may contain different ages of majority with individuals from different countries listed under their laws and regulations.