The "Public Trust" doctrine is a legal principle that is primarily related to Environmental laws. This doctrine states that certain natural resources, such as air, water, and wildlife, are held in trust by the government for the benefit of the public. Governments have the duty to protect and preserve these resources for the enjoyment and benefit of all people.
While criminal laws, journalism laws, and trademarks laws may also involve public policy and protection, the "Public Trust" doctrine is most relevant to environmental law.
Thus, the correct answer is Environmental laws.