Resonance stabilized cation is:

Options

A.
B.
C.
D.

Explanation

To determine which cation is resonance stabilized, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Resonance Stabilization**:
- Resonance stabilization occurs when a molecule can be represented by two or more valid Lewis structures, allowing the charge to be delocalized over multiple atoms. This delocalization leads to increased stability.

2. **Analyzing Option A**:
- Structure: A cation with a positive charge on nitrogen (N) and multiple double bonds.
- Upon resonance, breaking a bond leads to a structure where nitrogen has 10 electrons (which is not possible).
- Conclusion: Not resonance stabilized.

3. **Analyzing Option B**:
- Structure: A cation with a positive charge on oxygen (O) in an OH2+ group.
- Resonance leads to a structure where oxygen also has 10 electrons.
- Conclusion: Not resonance stabilized.

4. **Analyzing Option C**:
- Structure: A cation with a positive charge on nitrogen (N) and multiple double bonds.
- Upon resonance, breaking a bond allows the positive charge to be delocalized among the nitrogen atoms.
- This results in a valid structure where nitrogen does not exceed the octet rule.
- Conclusion: Resonance stabilized.

5. **Analyzing Option D**:
- Structure: Similar to option A, with a positive charge on nitrogen.
- Resonance leads to nitrogen having 10 electrons.
- Conclusion: Not resonance stabilized.

6. **Final Conclusion**:
- The only cation that is resonance stabilized is from **Option C**.

### Final Answer:
**Option C** is the resonance stabilized cation.