To determine the appropriate term to replace the question mark in the table comparing continental and oceanic landforms, we need to consider the definitions and characteristics of each option:
A. Cavern - Typically refers to a large cave, which is more of a landform found within continental environments rather than a term commonly used to describe broader categories of landforms.
B. Trench - Refers specifically to deep underwater valleys that occur in oceanic environments. This term would be relevant to oceanic landforms.
C. Plateau - This refers to an elevated flat area on land and is typically associated with continental landforms.
D. Mountain - This refers to elevated landforms on continents, often characterized by significant height differences relative to the surrounding area.
Given the context of comparing landforms, if the question asks to identify a general term that can apply to both continental and oceanic contexts, the best option would likely be D. mountain, as mountains exist in continental landforms and can be considered in relation to underwater mountains (such as mid-ocean ridges) in oceanic contexts.
So, the answer is: D. mountain.