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:
Greenwell was convicted of escaping from the District of Columbia Department of Corrections Maximum Security Facility at Lorton, Virginia. The escape occurred during the pendency of an appeal" from a conviction for an earlier escape, which we affirmed. United States v. Greenwell, 4 Cir., 418 F.2d 846. Appointed counsel on this appeal has indicated that he is unable to discover any meritorious issue. In accordance with Anders v. California, 386 U.S. 738, 87 S.Ct. 1396, 18 L.Ed.2d 493, he has filed a brief raising several “arguable” issues and has given Greenwell an opportunity to raise others. On review of the brief and the record we find further briefing or oral argument unnecessary and affirm the judgment of conviction.
Affirmed.

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