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.

JUDGMENT
PER CURIAM.
This cause came on to be heard on the record on appeal from the United States District Court for the District of Columbia, and was argued by counsel.
On consideration whereof it is ordered and adjudged by this Court that the order of the District Court, appealed from in this cause be, and it is hereby, affirmed for the reasons stated in Carl Zeiss Stiftung v. V. E. B. Carl Zeiss, Jena, D.D.C., 40 F.R.D. 318 (1966).

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: A