What follows is an opinion from a United States Court of Appeals. Your task is to identify the type of district court decision or judgment appealed from (i.e., the nature of the decision below in the district court).

Opinion:
NGUYEN DA YEN, Nguyen Da Vuong and Nguyen Da Tuyen, Plaintiffs-Appellants, v. Henry KISSINGER, James Schlesinger, Edward Levy, Colonel Robert V. Kane, Jasper Horn and Mario Obledo, Defendants-Appellees, and Friends For All Children, Friends of Children of Vietnam and Holt Adoption Program, Inc., Defendants in Intervention.
No. 76-1833.
United States Court of Appeals, Ninth Circuit.
July 11, 1979.
Nancy Stearns, New York City, Neil T. Gotanda, Oakland, Cal., argued, for plaintiffs-appellants.
John W. Keker, Kate C. Freeland, San Francisco, Cal., argued, for defendants-appellees.
Before CARTER and HUFSTEDLER, Circuit Judges, and FRANK J. MURRAY, District Judge.
Honorable Frank J. Murray, Senior District designation. Judge, District of Massachusetts, sitting by
ORDER
The district court having refused to certify the class on behalf of which the suit was brought (Nguyen Da Yen v. Kissinger, 70 F.R.D. 656 (N.D.Cal.1975)), and the named plaintiffs having sought and obtained dismissal of their claims, no controversy remains and we are forced to dismiss this appeal for mootness. Vun Cannon v. Breed, 565 F.2d 1096 (9th Cir. 1977). Nothing expressed or implied in this Order is intended to foreclose any parent or child from seeking any remedy to which he or she is entitled, or from raising any of the issues previously raised by appellants herein.

Question: What is the type of district court decision or judgment appealed from (i.e., the nature of the decision below in the district court)?

Choices:
Trial (either jury or bench trial)
Injunction or denial of injunction or stay of injunction
Summary judgment or denial of summary judgment
Guilty plea or denial of motion to withdraw plea
Dismissal (include dismissal of petition for habeas corpus)
Appeals of post judgment orders (e.g., attorneys' fees, costs, damages, JNOV - judgment nothwithstanding the verdict)
Appeal of post settlement orders
Not a final judgment: interlocutory appeal
Not a final judgment: mandamus
Other (e.g., pre-trial orders, rulings on motions, directed verdicts) or could not determine nature of final judgment
Does not fit any of the above categories, but opinion mentions a "trial judge"
Not applicable (e.g., decision below was by a federal administrative agency, tax court)

Answer: 4