21. According to the prefix “sub", which of the following word defines “subterranean""
Answer: D
Subterranean means underground.
The prefix "sub" indicates something that is beneath or below. Therefore, "subterranean" specifically refers to something that is located underground.
A) Overpass
"Overpass" refers to a bridge or structure that allows one road to pass above another, which is the opposite of what "subterranean" signifies. Hence, this option is incorrect.
B) Causeway
A "causeway" is a raised road or path that passes over wet ground or water, typically above the surface. This definition does not align with the meaning of "subterranean," making this option incorrect.
C) Aboveground
"Aboveground" clearly denotes anything that is located on or above the surface of the earth, which is directly contrary to the definition of "subterranean." Thus, this option is incorrect.
D) Underground
"Underground" is the precise definition of "subterranean," as both terms refer to something that exists beneath the surface of the earth. This makes option D the correct answer.
Conclusion
The term "subterranean" is accurately defined by the word "underground," which corresponds directly with the prefix "sub" indicating a location beneath the surface. All other options fail to capture this essential meaning, as they refer to structures or conditions that are above the ground, highlighting why D is the only correct choice.