Task: songer_source

What follows is an opinion from a United States Court of Appeals. Your task is to identify the forum that heard this case immediately before the case came to the court of appeals.

PER CURIAM.
These are writs of error to the municipal court, and involve an interpretation of the Act of June 4,1924 (43 Stat. 367). Since the facts in these cases do not differ materially from the facts in District of Columbia v. Newman (No. 4803) 59 App. D. C. 163, 37 F.(2d) 444, decided February 25, 1929, in which an application for rehearing has this day been denied, the judgments in these eases are affirmed, with costs, on the authority of that case.
Affirmed, with costs.

Question: What forum heard this case immediately before the case came to the court of appeals?
A. Federal district court (single judge)
B. 3 judge district court
C. State court
D. Bankruptcy court, referee in bankruptcy, special master
E. Federal magistrate
F. Federal administrative agency
G. Court of Customs & Patent Appeals
H. Court of Claims
I. Court of Military Appeals
J. Tax Court or Tax Board
K. Administrative law judge
L. U.S. Supreme Court (remand)
M. Special DC court (not the US District Court for DC)
N. Earlier appeals court panel
O. Other
P. Not ascertained
Answer:

Answer: M