The correct answer is large statue.
Colossus
A. internal organ
B. colloidal solution
C. Roman amphitheatre
D. large statue
The correct answer is (D) A (gigantic) statue; anything of immense size or power, especially a huge statue. Anything that is colossal or gigantic. 
Colossus comes from Greek kolossos.
Examples of use:
- The new automobile manufacturing plant certainly is a colossus.
 - The world's best-known colossus may be the Statue of Liberty.