Out of the 75 birders, 15 wanted to see only sunbird, 10 wanted to see only flycatcher, 12 wanted to see both sunbird and nuthatch, 15 wanted to see only bee-eater, 13 wanted to see both sunbird and bee-eater, 5 wanted to see both flycatcher and nuthatch and the remaining wanted to see only nuthatch.
The difference between the birders who want to see sunbird and those who want to see flycatchers is?

Options

A. A. 12
B. B. 25
C. C. 30
D. D. 15

Answer

To solve the problem, we need to determine how many birders wanted to see sunbirds and how many wanted to see flycatchers, then find the difference between these two groups.

### Step-by-Step Solution:

1. **Identify the Groups for Sunbirds:**
- Birders who want to see only sunbirds: 15
- Birders who want to see both sunbirds and nuthatch: 12
- Birders who want to see both sunbirds and bee-eaters: 13

**Total for Sunbirds:**
\[ \text{Total Sunbird Birders} = 15 + 12 + 13 = 40 \]

2. **Identify the Groups for Flycatchers:**
- Birders who want to see only flycatchers: 10
- Birders who want to see both flycatchers and nuthatch: 5

**Total for Flycatchers:**
\[ \text{Total Flycatcher Birders} = 10 + 5 = 15 \]

3. **Calculate the Difference:**
- Difference between the number of birders who want to see sunbirds and those who want to see flycatchers:
\[ \text{Difference} = \text{Total Sunbird Birders} - \text{Total Flycatcher Birders} = 40 - 15 = 25 \]

### Final Answer:
The difference between the birders who want to see sunbirds and those who want to see flycatchers is **25**.