Task: songer_casetyp1_7-3-3

What follows is an opinion from a United States Court of Appeals.
Your task is to identify the issue in the case, that is, the social and/or political context of the litigation in which more purely legal issues are argued. Put somewhat differently, this field identifies the nature of the conflict between the litigants. The focus here is on the subject matter of the controversy rather than its legal basis.
Your task is to determine the specific issue in the case within the broad category of "economic activity and regulation - commercial disputes". 

SCHNACKENBERG, Circuit Judge.
By his amended complaint filed in the' district court, plaintiff sought cancellation of releases executed by him in favor of defendant Gilpin and a confirmation of plaintiff’s claimed interest in a certain oil lease. Defendants having filed answers, the case was tried by the district court without a jury and it was stipulated that the releases might be set aside and that the sole issue became the nature and extent, if any, of plaintiff’s interest in certain oil production in a tract of" land in White county, Illinois.
The district court made findings of fact and conclusions of law and entered a judgment in favor of defendants, from, which this appeal was taken by plaintiff.
An opinion was filed by the district court, 150 F.Supp. 471. In that opinion, the lower court has adequately and correctly marshaled the pertinent facts and applied to them the correct principles of law. It has reached a right result. We' see no reason to encumber the shelves of the law libraries with an expression of our views. We are content to adopt the opinion of the district court, which we~ now do.
For that reason, the judgment from, which the appeal was taken is affirmed-
Affirmed.

Question: What is the specific issue in the case within the general category of "economic activity and regulation - commercial disputes"?
A. contract disputes-general (private parties) (includes breach of contract, disputes over meaning of contracts, suits for specific performance, disputes over whether contract fulfilled, claims that money owed on contract) (Note: this category is not used when the dispute fits one of the more specific categories below)
B. disputes over government contracts
C. insurance disputes
D. debt collection, disputes over loans
E. consumer disputes with retail business or providers of services
F. breach of fiduciary duty; disputes over franchise agreements
G. contract disputes - was there a contract, was it a valid contract ?
H. commerce clause challenges to state or local government action
I. other contract disputes- (includes misrepresentation or deception in contract, disputes among contractors or contractors and subcontractors, indemnification claims)
J. private economic disputes (other than contract disputes)
Answer:

Answer: J