Which term describes the camera's sensitivity to available light?

• A. Shutter Speed
• B. Aperture
• C. ISO
• D. White Balance

Answer: (C)

The main idea here is sensor sensitivity to light. ISO describes how sensitive the camera sensor is to the available light. When you raise the ISO, the sensor becomes more responsive, so you can shoot in darker conditions without using a longer exposure or a wider aperture. That helps avoid motion blur and underexposure, but it comes at the cost of more digital noise, which can reduce image quality. Keeping ISO low in bright light produces cleaner images but requires more light or a shorter exposure. Shutter speed is about how long the sensor is exposed to light, aperture is about how much light enters the lens, and white balance adjusts color temperature—none of those describe the sensor’s sensitivity.