Final answer:
In portrait mode, digital cameras will use a larger aperture to focus the subject and blur the background, this setup compensates for fast shutter speed reducing light entry for proper exposure.
Step-by-step explanation:
In portrait mode, a digital camera will use a larger aperture to create a narrow depth of field, which means that the subject is in focus while the background is out of focus. The larger aperture (smaller f-stop number) allows more light to enter during the short exposure time, compensating for the reduced light allowed by the fast shutter speed. When a digital camera is in portrait scene mode, it automatically sets this larger aperture for you, and adjusts the shutter speed accordingly to ensure a well-exposed image.
Understanding the basics of shutter speed and aperture is essential in photography. A faster shutter speed, generally 1/250th of a second or faster, is necessary to freeze action, as a long exposure can result in a blurred image due to motion. However, because fast shutter speeds allow less light to hit the camera's sensor, a larger aperture may be required to let in enough light for a proper exposure.
Therefore, for the question asked, the answer would be c) A larger aperture.