Answer:
The most related question to the field of biology is option D. where the average length of a cobra is asked as biology deals with living organisms.
Biology is the branch of science where life and different aspects of living organisms are studied. There are many different fields of biology such as physiology, zoology, botany, anatomy, biotechnology, and morphology, and many more.
There are other branches of sciences that deal with other than life and living organisms such as geography, astronomy, physics, and others that deal with types of rocks, space, and mass of an object or body.
Cobra is the only living organism among all the given options therefore the average length of a cobra is the only question related to biology.
Step-by-step explanation: