Which of the following is not generally associated with a lane designated for turning left? a. an arrow pavement marking b. an arrow traffic signal c. an arrow warning sign d. a thick solid white line

The correct answer is letter D: A thick solid white line.

A thick solid white line generally separate lanes and indicate either a car can change lanes, if cars are not allowed to change lanes or if a lane will end. Sometimes they also can indicate cross walks, stop lines or parking stalls. But people associate this white lines with separating two lanes.

On the other side, people will associate any sign with an arrow to a "turning" signal. Therefore options A, B and C are generally associated with turning left or right lanes.

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.