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.
This is an appeal from an order denying a motion made under 28 U.S.C.A. § 2255 to vacate a judgment and sentence of imprisonment in a criminal case. The motion did no more than challenge the sufficiency of the proofs at the trial in which the prisoner was convicted; and it is too well settled to admit of argument that questions of this sort may not be raised by motion under 28 U.S.C.A. § 2255. Howell v. United States, 4 Cir., 172 F.2d 213, Taylor v. United States, 4 Cir., 177 F.2d 194.
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