What follows is an opinion from a United States Court of Appeals.
Intervenors who participated as parties at the courts of appeals should be counted as either appellants or respondents when it can be determined whose position they supported. For example, if there were two plaintiffs who lost in district court, appealed, and were joined by four intervenors who also asked the court of appeals to reverse the district court, the number of appellants should be coded as six.
When coding the detailed nature of participants, use your personal knowledge about the participants, if you are completely confident of the accuracy of your knowledge, even if the specific information is not in the opinion. For example, if "IBM" is listed as the appellant it could be classified as "clearly national or international in scope" even if the opinion did not indicate the scope of the business. 

Your task concerns the first listed appellant. The nature of this litigant falls into the category "private business (including criminal enterprises)". Your task is to determine what category of business best describes the area of activity of this litigant which is involved in this case.

Opinion:
John S. SORENSON and T. S. B. Nielsen, Copartners Trading under the Firm Name and Style of Sorenson & Nielsen, Appellants, v. BELTS WHARF WAREHOUSE, Inc., Curtis Bay Towing Company, and Monarch Stevedore Company, Appellees. J. ARON & COMPANY, Inc., on Behalf of Itself and of Its Automobile Insurance Company, Intervening Petitioner, Appellant, v. BELTS WHARF WAREHOUSE, Inc., Curtis Bay Towing Company and Monarch Stevedore Company, Appellees.
(Circuit Court of Appeals, Fourth Circuit.
January 15, 1926.)
Nos. 2405, 2406.
Appeals from the District Court of the United States for the District of Maryland, at Baltimore.
Frank B. Ober and Stuart S. Janney, both of Baltimore, Md. (Janney, Ober, Slingluff & Williams, of Baltimore, Md., and Bigham, Englar & Jones, of New York City, on the brief), for appellants.
L. Vernon Miller and Frank Gosnell, both of Baltimore, Md. (Marbury, Gosnell & Williams, of Baltimore, Md., on the brief), for appellees.
Before ROSE and PARKER, Circuit Judges, and WATKINS, District Judge.
PER CURIAM.
These appeals bring up for review no questions of law. They turn upon matters of fact, or upon what are the inferences properly to he drawn from facts admitted or supposed to be proved. Wo have examined the record, and are satisfied with the conclusion below.
Affirmed.

Question: This question concerns the first listed appellant. The nature of this litigant falls into the category "private business (including criminal enterprises)". What category of business best describes the area of activity of this litigant which is involved in this case?

Choices:
agriculture
mining
construction
manufacturing
transportation
trade
financial institution
utilities
other
unclear

Answer: 5