An example of ex situ conservation is:

Options

A. Sacred Groves
B. National Park
C. Seed Bank
D. Wildlife Sanctuary

Answer

### Step-by-Step Solution:

1. **Understanding Ex Situ Conservation**:
- Ex situ conservation refers to the conservation of species outside their natural habitats. This includes methods such as maintaining species in zoos, botanical gardens, seed banks, and aquariums.

2. **Analyzing the Options**:
- **Option A**: Second group (not specified in the question) - This is likely referring to a group of species that are conserved in their natural habitats, thus it represents in situ conservation.
- **Option B**: National Park - This is a protected area where species are conserved in their natural habitats, which also falls under in situ conservation.
- **Option C**: Seed bank - This is a facility where seeds are stored and preserved outside their natural environment, making it a clear example of ex situ conservation.
- **Option D**: Wildlife Sanctuary - Similar to national parks, wildlife sanctuaries are areas designated for the protection of animals in their natural habitats, thus representing in situ conservation.

3. **Identifying the Correct Answer**:
- After analyzing all the options, it is clear that the only example of ex situ conservation is **Option C: Seed bank**.

### Final Answer:
**The correct answer is Option C: Seed bank.**