What should be done to remove a portion of a photograph and change its orientation from vertical to horizontal?

To change a photograph's orientation from vertical to horizontal while removing a portion of it, using the cropping tool followed by rotating the image is the most effective approach. Cropping allows you to select and remove the unwanted areas of the image, focusing on the part that you want to keep. After cropping, rotating the image 90 degrees changes its orientation from vertical to horizontal.

Cropping is essential for refining the composition of a photograph by eliminating unnecessary background or distracting elements, ensuring that only the most relevant part of the image remains. In this case, it effectively sets up the photograph for orientation adjustment.

Rotating the image after cropping ensures that you achieve the desired horizontal format without any additional alterations that might distort or negatively impact the content. This method provides a straightforward way to modify the size and orientation of the image simultaneously, making option A the correct choice.

In contrast, other options involve terms like "clip," which typically refers to a different process that may not necessarily achieve the same result as cropping, or include flipping, which would not change the orientation in the desired manner. Thus, focusing on cropping and rotating is the most direct and appropriate method for the task described.