D

Step 1: Understand the concept of elastic limit in materials. The elastic limit is the maximum extent to which a solid material can be deformed elastically (i.e., non-permanently) such that it returns to its original shape when the load is removed.
Step 2: Analyze gases. Gases, unlike solids, do not have a fixed shape and size. They fill the volume of their container and do not experience elastic deformation in the same way solids do. Instead, gases obey laws of fluid mechanics, such as Boyle's Law and Charles's Law.
Step 3: Conclude that since elastic deformation and return to original shape is not applicable to gases, the concept of an 'elastic limit' does not exist. Hence, the correct answer is: D.