Task: Question Generation
Input (English):  Spoiled heiress Ellen "Ellie" Andrews has eloped with pilot and fortune-hunter "King" Westley against the wishes of her extremely wealthy father, Alexander, who wants to have the marriage annulled because he knows that Westley is really only interested in her money. Jumping ship in Florida, she runs away, boarding a bus to New York City to reunite with her new spouse, when she meets fellow bus passenger Peter Warne, a freshly out-of-work newspaper reporter. Soon Warne recognizes her and gives her a choice: If she will give him an exclusive on her story, he will help her reunite with Westley. If not, he will tell her father where she is. Ellie agrees to the first choice.
As they go through several adventures together, Ellie loses her initial disdain for him and begins to fall in love. When they have to hitchhike, Peter fails to draw attention until Ellie displays a shapely leg to Danker, the next driver. When they stop en route, Danker tries to steal their luggage, but Peter seizes his car. Nearing the end of their journey, Ellie confesses her love to Peter. When the owners of the motel in which they are staying notice that Peter's car is gone, they expel Ellie. Believing Peter has deserted her, Ellie telephones her father, who agrees to let her marry Westley. Meanwhile, Peter has obtained money from his editor to marry Ellie, but misses her on the road. Although Ellie has no desire to be with Westley, she believes Peter has betrayed her for the reward money, and agrees to have a second, formal wedding to Westley.
On her wedding day, she finally reveals the whole story. When Peter comes to Ellie's home, Mr. Andrews offers him the reward money, but Peter insists on being paid only his expenses: a paltry $39.60. When Ellie's father presses him for an explanation of his odd behavior, Peter admits he loves Ellie, and storms out. Westley arrives for his wedding via autogyro but at the wedding ceremony, Mr. Andrews reveals Peter's refusal of the reward money to Ellie, sends her to Peter, and pays Westley off.
Output (English): Why does Alexander want his daughters marriage to Westley annulled?