Consider the following events.

1. First reptiles
2. First insects
3. Shelled animals
4. First mammals

Arrange the above events in Chronological order of their origin on the earth and select the correct answer from the codes given below:

Codes:

A) 2 1 3 4

B) 2 3 1 4

C) 3 2 1 4

D) 2 4 1 3

This MCQ is part of the UP PSC Previous Year Questions (PYQs) series, focusing on UPPSC Prelims 2018 (GS Paper I)