Enzymes are catalysts found in organisms. They are biological molecules (typically proteins) that speed up chemical reactions by lowering the activation energy, which is the energy required to start a reaction. Enzymes are essential for various biological processes and are involved in countless reactions occurring within living organisms.

Here is a detailed explanation of why option 'C' is the correct answer:

Enzymes as catalysts found in organisms:
Enzymes are naturally occurring catalysts found in living organisms, including plants, animals, and microorganisms. They play a crucial role in metabolic pathways, allowing complex reactions to occur efficiently at relatively low temperatures and with high specificity. Enzymes facilitate reactions by binding to specific molecules, called substrates, and converting them into products. They do not get consumed or altered during the reaction and can be used repeatedly.

Role of enzymes in biological processes:
Enzymes participate in various biological processes such as digestion, respiration, DNA replication, and cellular metabolism. Each enzyme has a specific function and acts on a particular substrate. For example, the enzyme amylase facilitates the breakdown of starch into simple sugars during digestion, while DNA polymerase is responsible for synthesizing new strands of DNA during replication.

Characteristics of enzymes:
Enzymes exhibit several unique characteristics that make them highly efficient catalysts:

1. Specificity: Enzymes are highly specific, meaning they can recognize and bind to particular substrates due to their unique three-dimensional structure.

2. Efficiency: Enzymes can dramatically increase the rate of a reaction, often by several million times, by lowering the activation energy required for the reaction to occur.

3. Regulation: Enzyme activity can be regulated to maintain optimal conditions for biological processes. Factors such as temperature, pH, and the concentration of substrates or inhibitors can influence enzyme activity.

4. Reusability: Enzymes are not consumed during a reaction and can be used repeatedly, making them highly efficient catalysts.

Conclusion:
Enzymes are catalysts found in organisms that play a vital role in various biological processes. They are highly efficient, specific, and reusable catalysts that enable essential chemical reactions to occur at a faster rate and under mild conditions. Option 'C' correctly identifies enzymes as catalysts found in organisms.