Question

which of these actions is forbidden by the constitution?
○ creating a law ex post facto
○ borrowing money from the government
○ passing
ecessary and proper\ laws
○ regulating trade with foreign countries

Explanation:

The U.S. Constitution forbids ex post facto laws (laws that retroactively change the legal consequences of actions committed before the law was enacted). Borrowing money from the government is not forbidden, Congress can pass "necessary and proper" laws (implied powers), and regulating foreign trade is a power of Congress (enumerated power). So the action forbidden by the Constitution is creating a law ex post facto.

Answer:

A. creating a law ex post facto