Final answer:
Kathy indeed pops out of a cake at a party for Don and Lina in the movie 'Singin' in the Rain', which is True; this is a significant scene that emphasizes the dynamics of the characters involved. The correct option is 1.
Step-by-step explanation:
The question pertains to a specific scene in the film Singin' in the Rain, in which Kathy Selden (played by Debbie Reynolds) is supposed to pop out of a cake at a party celebrating the on-screen couple Don Lockwood and Lina Lamont.
The correct answer to whether Kathy pops out of a cake at a studio party for Don and Lina is Option 1: True. This scene is a comedic and iconic moment in the film, which highlights the growing romantic tension between Kathy and Don, while also exposing the jealous nature of Lina Lamont.