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 second listed appellant. The nature of this litigant falls into the category "private business (including criminal enterprises)", specifically "unclear". Your task is to determine what subcategory of business best describes this litigant.

Opinion:
STANWICK’S, Inc., and Fred H. Alperstein, Petitioners, v. COMMISSIONER OF INTERNAL REVENUE, Respondent.
No. 6251.
United States Court of Appeals Fourth Circuit.
Argued June 25, 1951.
Decided June 25, 1951.
I. Herman Sher, New York City (Martin A. Roeder, New York City, on brief), for Petitioners. Melva M. Graney, Sp. Asst, to Atty. Gen. (Theron Lamar Caudle, Asst. Atty. Gen. and Ellis N. Slack, Sp. Asst, to Atty. Gen., on brief), for respondent.
Before PARKER, Chief Judge, SOPER, Circuit Judge, and TIMMERMAN, District Judge.
PER CURIAM.
The decisions of the. Tax Court in this case are affirmed for reasons adequately stated in the opinion of that court. 15 T.C. 556.
Affirmed.

Question: This question concerns the second listed appellant. The nature of this litigant falls into the category "private business (including criminal enterprises)", specifically "unclear". What subcategory of business best describes this litigant?

Choices:
auto industry
chemical industry
drug industry
food industry
oil & gas industry
clothing & textile industry
electronic industry
alcohol and tobacco industry
other
unclear

Answer: 9