Answer:
The correct answer is option D) amphibious
Step-by-step explanation:
The word amphibious, also called amphibian, is an adjective used to describe a a type of animal that can live in the water and in the land such as the frog. Amphibiuos is a word of latin origin that meant living a double life.
The rest of the options are incorrect since they do not mean " adapted for both land and water." Dubious: having doubts, ambitious: wanting to succeed, amplified: increasing the sound volume.