Amongst the following solutions, the buffer solution is
Or
A basic buffer is made by mixing the solution

Options

A. `NH_(4)Cl+NH_(4)OH` solution
B. `NH_(4)Cl + NaOH` solution
C. `NH_(4)OH + HCl` solution
D. `NaOH + HCl` solution

Explanation

To determine which of the given solutions is a buffer solution, we need to understand the characteristics of buffer solutions, particularly basic buffers.

### Step-by-Step Solution:

1. **Definition of Buffer Solution**:
A buffer solution is defined as a solution that resists changes in pH when small amounts of acid or base are added.

2. **Types of Buffer Solutions**:
There are two main types of buffer solutions:
- **Acidic Buffer**: Made from a weak acid and its conjugate base.
- **Basic Buffer**: Made from a weak base and its conjugate acid.

3. **Identifying a Basic Buffer**:
For a solution to be classified as a basic buffer, it must contain:
- A weak base.
- The conjugate acid of that weak base.

4. **Analyzing the Options**:
We need to examine the provided options to identify which one contains a weak base and its conjugate acid.

- **Option 1: NH4OH (Ammonium Hydroxide)**:
- NH4OH is a weak base.
- The conjugate acid of NH4OH is NH4Cl (Ammonium Chloride).
- This option fits the criteria for a basic buffer.

- **Option 2: NH4OH and NH4OH**:
- This suggests two concentrations of the same weak base, which does not provide a conjugate acid. Thus, it cannot be a buffer.

- **Option 3: HCl (Hydrochloric Acid)**:
- HCl is a strong acid and does not form a buffer solution.

- **Option 4: Another strong base (not specified)**:
- Similar to HCl, a strong base cannot form a buffer solution.

5. **Conclusion**:
Based on the analysis, the only option that qualifies as a basic buffer solution is Option 1, which contains NH4OH and its conjugate acid.

### Final Answer:
The buffer solution is **Option 1: NH4OH** (Ammonium Hydroxide).