Which tool or command should be used to straighten, crop, and resample an image in one step?

Using the Crop Tool with the Level option is the ideal choice for straightening, cropping, and resampling an image in one step. This functionality allows users to adjust the image's perspective, correct any tilt, and define the area of the image they wish to keep, all while specifying the resolution and dimensions.

When you select the Crop Tool and enable the Level option, you can drag along a line in the image to define the tilt correction. This makes it a powerful tool for quickly refining both the composition and usability of an image without the need for multiple steps or tools.

In contrast, the Transform Tool is primarily used for scaling, rotating, or distorting an image, without the specific capabilities for cropping or setting image resolution directly. The Rectangular Marquee Tool is suited for making selections but does not offer cropping or resampling in a single action. Free Transform is also focused on manipulating the size and orientation of layers rather than combining straightening, cropping, and resampling.