The correct answer is option 'D' - Azoic era. In this era, there was no life present. Let's understand why this is the correct answer in more detail.

1. The Azoic Era:
The Azoic era, also known as the Pre-Cambrian era or Cryptozoic era, is a geological period that spanned from about 4.6 billion to 541 million years ago. It is the earliest part of Earth's history and is characterized by the absence of life forms. The term "Azoic" means "without life."

2. Mesozoic Era:
The Mesozoic era is a geological era that occurred from about 252 to 66 million years ago. It is often referred to as the Age of Reptiles because it was dominated by reptiles, including dinosaurs. This era witnessed the diversification and evolution of various groups of organisms, including dinosaurs, mammals, birds, and flowering plants.

3. Paleozoic Era:
The Paleozoic era is a geological era that spanned from about 541 to 252 million years ago. It is often referred to as the Age of Invertebrates because it was characterized by the dominance of invertebrate animals. This era witnessed the development of various marine organisms, including trilobites, brachiopods, and early fish.

4. Cenozoic Era:
The Cenozoic era is a geological era that began about 66 million years ago and continues to the present day. It is often referred to as the Age of Mammals because it is marked by the diversification and dominance of mammals on Earth. This era witnessed the evolution of various mammalian groups, including primates, whales, elephants, and humans.

5. Explanation:
The Azoic era, as mentioned earlier, is characterized by the absence of life forms. It predates the Mesozoic, Paleozoic, and Cenozoic eras, which all had the presence of life forms. Therefore, the correct answer is option 'D' - Azoic era.

In summary, the Azoic era is the correct answer because it represents a geological period in which there was no life present. The Mesozoic era, Paleozoic era, and Cenozoic era all had the presence of various organisms and are known for their evolutionary and diversification events.