What is considered the most important power congress holds

The power to make laws

Explanation:

The Constitution specifically grants Congress its most important power — the authority to make laws. A bill, or proposed law, only becomes a law after both the House of Representatives and the Senate have approved it in the same form. The two houses share other powers, many of which are listed in Article I, Section 8.

i believe the answer is d.

where is thing if you show me on the map or have a map i can answer your question