Explanation/Reference:
The Dot Gain value identifies the dot gain of the paper on which the image will be printed. Dot gain indicates how much each dot of ink will spread when it's applied to the paper. More absorbent paper, such as newsprint, will absorb more ink, resulting in greater dot gain. You can specify the Dot Gain value so that Photoshop will apply less ink to compensate for the dot gain.
The standard Dot Gain value is 20%. This value indicates that when you specify a 60% halftone dot, for example, it will end up measuring 80% due to dot gain.
Answer option C is incorrect. Too much black ink can result in a muddy image with loss of detail in the shadows. To avoid too heavy an application of black ink, you can limit the amount of it used during printing; you do this by specifying a lower value in the Black Ink Limit box.
Answer option B is incorrect. Select GCR to specify how the neutral areas made up of cyan, magenta, and yellow are replaced with black ink.