Which of the following statements is true regarding the Terrain Tools in Unity?

The statement that the Terrain Tools assist with creating and modifying landscapes in 3D environments is accurate because these tools specifically cater to the needs of developers working with 3D terrains. Unity's Terrain Tools allow for the creation of expansive, detailed landscapes by providing functionalities such as sculpting terrain height, painting textures, and placing vegetation. These features are essential for crafting immersive 3D worlds, enabling developers to build environments that enhance gameplay and visual appeal.

The other options do not align with the primary purpose of the Terrain Tools. While optimizing texture resolution is important in game development, it is not a direct function of the Terrain Tools themselves. Character rigging pertains to preparing 3D models for animation, which is outside the scope of what Terrain Tools are designed for. Furthermore, the mention of being exclusive to 2D game development is inaccurate, as Terrain Tools are inherently linked to 3D environment creation, reinforcing the correctness of the selected answer.