A person would-adjust the contrast by A. brightening the lighter sections of a picture. B. changing the image's ultraviolet selection. C. using a camera lens to focus the photograph. D. increasing the length of time of the exposure.

## Step 1<br />The question is asking about the method a person would use to adjust the contrast in a photograph. Contrast in photography refers to the difference in brightness between the lightest and darkest parts of an image.<br /><br />## Step 2<br />Option A suggests that the contrast can be adjusted by brightening the lighter sections of a picture. This is a correct method to increase contrast. By brightening the lighter sections, the difference in brightness between the lightest and darkest parts of the image is increased, thus increasing the contrast.<br /><br />## Step 3<br />Option B suggests that the contrast can be adjusted by changing the image's ultraviolet selection. This is not a correct method to adjust contrast. Ultraviolet selection is related to the type of light that the camera captures, not the contrast of the image.<br /><br />## Step 4<br />Option C suggests that the contrast can be adjusted by using a camera lens to focus the photograph. This is not a correct method to adjust contrast. The focus of a photograph is related to the sharpness of the image, not the contrast.<br /><br />## Step 5<br />Option D suggests that the contrast can be adjusted by increasing the length of time of the exposure. This is not a correct method to adjust contrast. The length of time of the exposure is related to the amount of light captured by the camera, not the contrast of the image.