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:
Paul Walton appeals from his conviction for refusing to submit to induction, in violation of 50 U.S.C. App. § 462. We affirm.
In June 1968, Walton was classified IA. He did not appeal this classification. However, in February 1970, he requested a Form 150 (conscientious-objector application). He completed the form and returned it to his local board on March 3, 1970, with a letter which read: “I would at this time like to place my case on appeal for classification I-O.”
The board rejected the conscientious-objector application June 24, 1970, and notified Walton of his right to appeal within 30 days. He did nothing until September 1970, when he refused induction.
Walton now says that his letter of March 3, 1970, should be treated as a notice of appeal from the board’s decision of June 24, 1970, three months later. We agree with the district court’s refusal to treat an anticipatory letter as a notice of appeal. A notice of appeal after a decision is entitled to liberal construction. A purported notice of appeal in advance of decision is not entitled to any construction. It is a nullity.
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: D