What technique allows the audience to focus on a specific part of an image by using a shallow depth of field?

The technique that enables the audience to concentrate on a specific part of an image by utilizing a shallow depth of field is indeed shallow depth of field. This photography and cinematography method involves blurring the background while keeping the subject in sharp focus, effectively isolating the subject from its environment. This creates a sense of depth and draws the viewer's attention directly to the intended focal point without distractions from other elements in the scene.

In contrast, while a wide angle shot encompasses more of the scene and can capture expansive backgrounds, it doesn't achieve the same focused attention on a particular subject. Deep focus, on the other hand, keeps everything in the frame sharp, which can lead the viewer's eye across the depth of the scene rather than focusing on a single element. High contrast primarily refers to the difference in luminance or color that makes elements in an image stand out but does not specifically dictate the focus of attention in the same way that shallow depth of field does. Thus, shallow depth of field serves the purpose of highlighting and directing viewer focus, making it the correct choice.