Amongst the animal groups given below, which one has the highest percentage of endangered species?
(a) Insects
(b) Mammals
(c) Amphibians
(d) Reptiles

Options

A. Insects
B. Mammals
C. Amphibians
D. Reptiles

Explanation

To determine which animal group has the highest percentage of endangered species among the options provided, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: We need to identify which of the given animal groups has the highest percentage of endangered species.

2. **Review the Options**: The options provided are:
- (a) Insects
- (b) Mammals
- (c) Amphibians
- (d) Reptiles

3. **Research Endangered Species Statistics**: According to the International Union for Conservation of Nature (IUCN) and their red listing criteria, we need to look at the percentages of endangered species in each group:
- Birds: Approximately 12% are endangered.
- Mammals: Approximately 23% are endangered.
- Gymnosperms: Approximately 31% are endangered.
- Amphibians: Approximately 32% are endangered.

4. **Compare the Percentages**:
- Insects: Not specifically mentioned, but generally have a lower percentage compared to the others.
- Mammals: 23% endangered.
- Amphibians: 32% endangered.
- Reptiles: Not specifically mentioned, but typically lower than amphibians.

5. **Identify the Highest Percentage**: From the data, it is clear that amphibians have the highest percentage of endangered species at 32%.

6. **Conclusion**: Therefore, the group with the highest percentage of endangered species is **(c) Amphibians**.

### Final Answer:
(c) Amphibians