What follows is an opinion from a United States Court of Appeals. Your task is to identify the circuit of the court that decided the case.

Opinion:
Mrs. Lucretia BIVENS, as Legal Guardian of Raymond Jackson, an Incompetent, v. Davis A. JACKSON et al.
No. 2122.
Circuit Court of Appeals, Tenth Circuit.
Nov. 18, 1940.
F. E. Riddle, of Tulsa, Old., for appellant.
Forrest M. Darrough, of Tulsa, Old., for appellees.
Before PHILLIPS and PIUXMAN, Circuit Judges.
PER CURIAM.
Appeal dismissed at costs of appellant, for failure to prosecute.

Question: What is the circuit of the court that decided the case?

Choices:
First Circuit
Second Circuit
Third Circuit
Fourth Circuit
Fifth Circuit
Sixth Circuit
Seventh Circuit
Eighth Circuit
Ninth Circuit
Tenth Circuit
Eleventh Circuit
District of Columbia Circuit

Answer: 9