What factor can significantly influence the file size of a video?

The bit depth and resolution settings are key factors that significantly influence the file size of a video.

Resolution refers to the dimensions of the video, typically expressed in pixels (e.g., 1920x1080 for Full HD). A higher resolution means more pixels to encode, which directly increases the file size because there is more visual information to store.

Bit depth, on the other hand, involves the amount of color information for each pixel. A higher bit depth allows for a wider range of colors, which enhances image quality but also adds to the file size. For example, a video with 8-bit depth can display 256 colors per channel, while a 10-bit depth can display over a thousand, meaning more data per frame.

Together, increased resolution and bit depth result in larger file sizes because both factors contribute to more data being required to encode each frame of the video. This makes option C the correct choice in understanding what affects video file size.