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 action by a subcontractor, a plasterer, against the general contractor on the construction of an addition to a hospital. The claim is for damages the subcontractor says he suffered because of delays in the work.
The case was tried by the District Court without a jury. The District Court found there was no unreasonable delay and the work of the subcontractor was substantially completed on schedule. It also found that the subcontractor did not complain of any delay until sometime after the work was substantially completed. When, finally, he did complain of delay in the work of the tile subcontractor, the defendant suggested he submit an itemized statement of the expense to which he had been put by reason of the claimed delay, offering to back charge the tile setter by that amount and to give the plaintiff credit for it. The plaintiff did not submit such a statement, but, some months later, entered into a final settlement of the contract and of all of the rights of the parties under it.
There is evidence which supports these findings. We accept them, as we must, and the findings lead necessarily to the conclusion that the judgment for the defendant must be affirmed.
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