With no explanation, chose the best option from "A", "B", "C" or "D". doctrine is triggered when some event ‘so alters the position of the parties that any judgment rendered [merely becomes] a hypothetical opinion.’ ” Thruston v. Jefferson City Sch. Dist., 95 S.W.3d 131, 134 (Mo.App. W.D. 2003) (quoting State ex rel. Reed v. Reardon, 41 S.W.3d 470, 473 (Mo. banc 2001)). The Board’s declaratory judgment petition seeks a determination as to the legality of the measure Lee’s Summit sought to place on the ballot for the November 7, 2006 election. That issue was moot by the time the circuit court issued its judgment in October 2007, however, because the election had already occurred and the ordinance had been passed, based on the Election Board’s agreement to place the issue on the ballot. See, e.g., Armstrong v. Elmore, 990 S.W.2d 62, 64 (Mo.App. W.D.1999)(<HOLDING>). The parties’ factual stipulation recites that

A: holding a case becomes moot when a ruling will have no practical effect upon the existing controversy
B: holding that because the april 7 1998 municipal election was held a decision by this court on the issue of whether the county clerk was mandated to place a particular question proposed by citizen petition on the april 7 1998 ballot would therefore have no practical effect upon an existent controversy or grant relief to plaintiff and would merely be an advisory opinion
C: recognizing that an advisory opinion is one that offers an opinion on a moot issue
D: holding that the case presented no justiciable controversy and that a review of the matter would render an improper advisory opinion
B.