Age of reptiles was known as
Mesozoic Era
The correct option is (A).
Explanation of the correct option:
Explanation of the incorrect options:
Option B:
Paleozoic Era is the earliest of three geologic eras of the Phanerozoic Eon and is known for the evolution of arthropods.
Option C:
Cenozoic Era is also known as the Age of Mammals because of the extinction of many groups of giant mammals.
Option D:
Archaeozoic Era is also called the ‘age of early unicellular life’. In this eon, life originated in the sea from organic molecules.
Final answer: Age of reptiles was known as Mesozoic Era.