Which tool in Adobe Animate allows you to apply gradients to objects?

The Gradient tool in Adobe Animate is specifically designed for applying gradients to objects. This tool enables users to create smooth transitions between two or more colors, which can help to enhance the visual appeal of graphics and animations. When using the Gradient tool, you can determine the direction and type of gradient—linear or radial—allowing for creative control over how the colors blend together.

Other tools mentioned have different functions; for instance, the Color picker is used to select colors from the color palette or to apply solid colors to objects. The Stroke tool is focused on modifying the lines or outlines of shapes rather than filling them with color or gradients. The Fill tool applies solid colors to objects, but it doesn't create gradient effects. Therefore, the Gradient tool stands out as the correct answer as it is the only one that directly facilitates the use and application of gradient effects.