Whose responsibility is it to create the visual concept of the film and oversee the art department?

The correct choice is Production Designer because this individual is specifically tasked with creating the overall visual concept of the film. The Production Designer is responsible for designing the sets, selecting colors, and determining the visual style that aligns with the film's narrative and themes. They lead the art department, coordinating with various artists and craftsmen such as set decorators, prop masters, and graphic artists to ensure that all visual elements come together cohesively. This role is crucial in shaping how the world of the film appears on screen, contributing significantly to the audience's immersion in the story.

The other roles, while vital to film production, focus on different aspects. The Production Manager handles logistics, budgets, and schedules, ensuring that the production runs smoothly and efficiently. The Director is primarily focused on guiding the overall vision of the film, directing the actors' performances, and overseeing the narrative flow. The Cinematographer, or Director of Photography, is responsible for the camera work, lighting, and shot composition, which are integral to capturing the visual style defined by the Production Designer but do not encompass the broader responsibilities of constructing the film's visual environment.