Explanation:
In this question, we are asked to identify the resource that is not an abiotic resource. To understand this, let's first define what abiotic resources are.

Abiotic resources are those resources that are derived from non-living things or non-biological materials. They are usually found in the environment and do not have any living components. Examples of abiotic resources include minerals, water, air, sunlight, etc.

Now let's analyze the options given:

a) Freshwater: Freshwater is a natural resource that is derived from rivers, lakes, and underground sources. It is considered an abiotic resource because it is a non-living material.

b) Coal: Coal is a fossil fuel that is derived from the remains of plants and trees that lived millions of years ago. It is considered an abiotic resource because it is derived from non-living organic matter.

c) Petroleum: Petroleum is also a fossil fuel that is derived from the remains of ancient marine organisms. It is considered an abiotic resource because it is derived from non-living organic matter.

d) Fish: Fish is a living organism and is therefore considered a biotic resource. Biotic resources are derived from living organisms and are not classified as abiotic resources.

Conclusion:
Based on the above analysis, we can conclude that the correct answer is option 'A' - Freshwater. Freshwater is considered an abiotic resource, and therefore it does not fit the criteria of being the correct answer.