If you know that a nation uses a parliamentary system of government, but have no other information, what do you know for certain about the structure of

a) who is allowed to participate in the governing process
b) the geographic distribution of power in the state
c) the relationship between the executive and legislative branches
d) that its laws must be collected in a written constitution

I believe the answer is: D) that its laws must be collected in a written constitution

In parliamentary system of government, the executive branch need the approval from the parliament in order to conduct a certain action.

Because of this, the system needs a written constitution to distinguish the power which limit the things that the executive branch can and cannot do.

C) the relationship between the executive and legislative branches.

Explanation:

A parliamentary system is one in which the executive power derives its democratic legitimacy from the trust it receives from the legislative branch. Moreover, the legislative branch is the one that holds the executive accountable. As this is a feature of all parliamentary systems, we can know for sure what the relationship between the executive and the legislative branches is. We cannot know for sure who is allowed to participate in the governing process or what the geographic distribution of power is. Finally, we also do not know whether its laws are collected in a written constitution (for example, the United Kingdom has a parliamentary system and an unwritten constitution).

trade regulation is a field of law, often bracketed with antitrust (as in the phrase “antitrust and trade regulation law”), including government regulation of unfair methods of competition and unfair or deceptive business acts or practices. antitrust law is often considered a subset of trade regulation law. franchise and distribution law, consumer protection law, and advertising law are sometimes considered parts of trade regulation law.

in general the theory of economics says that the more open to trade a country is the better   the result for the same country and the whole economies.

in real life countries impose taxes, quotas, etc which is not so good for the economies.

this kind of commercial war between the usa and china is slowing down the growth of the whole world so we can say that it is a draw back of trade regulations. and the free trade agreements are benefits of trade regulations.

a factory opens that mass-produces light bulbs.

explanation:

not sure if that's an answer to your questions but this is an example! : )