The correct answer is "protesters demonstrate on private property".
The is a quote that says that "the rights of someone end when the rights another start". This quote perfectly applies to the example, as protesters violating Article 17 of the Universal Declaration of Human Rights, which recognizes the right of an individual to private property.
By engaging in this sort of action, protesters are also committing an infraction on current civil law and might be subject to further punishment by authorities.
