Final answer:
The behavior Pedro experienced, where boys grabbed his rear end and laughed, classifies as a form of physical bullying. It is characterized by the use of physical actions and attempts at humiliation.
Step-by-step explanation:
The incident Pedro describes is a form of physical bullying. Bullying is the repeated negative treatment of another person, often characterized by attempts to inflict harm or humiliation. In this case, the boys' behavior of grabbing him is a physical action, and laughing about the behavior can also be seen as an attempt to humiliate, hence falling under physical bullying. This differs from cyberbullying, which involves the use of digital technology to harass someone, social bullying, which might include tactics like spreading rumors or social exclusion, and verbal bullying, which consists of using words to cause harm.