Ametro city ordinance imposes a jail term, without a trial, on all vendors who operate in certain areas. a court would likely review this ordinance under the principles of:
a) equal protection.
b) free exercise.
c) due process.
d) free speech.

C) due process.

Explanation:

The 5th Amendment of the US Constitution states that no individual may be deprived of life, liberty or property without due process of law.

All government levels (federal, state or local) must respect the rights of the individuals that live in them. Due process helps to protect individuals from  abuses committed by government authorities.

In this case, no one can be sent to jail without a trial being held. An individual can be arrested, but for a limited time and until a trial is held.