Final answer:
Nuke is the most suitable program for post-production of 3D elements due to its comprehensive 3D capabilities and compositing toolset.
Step-by-step explanation:
For post-production involving 3D elements, Nuke would be the best choice among the options provided. Adobe After Effects is also used in post-production primarily for 2D animation, while Adobe Photoshop and Adobe Illustrator are more suited for creating and editing static images and illustrations. Nuke is designed specifically for compositing and has powerful 3D capabilities, making it suitable for handling complex 3D elements and scenes, and providing a comprehensive toolset for 3D post-production work.