The most stable resonating structure of p-nitrosonitrobenzene is :

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D.

Explanation

To determine the most stable resonating structure of para-nitroso-nitrobenzene, we need to analyze the possible resonance structures and evaluate their stability based on two main criteria: the octet rule and the distribution of charges.

### Step-by-Step Solution:

1. **Identify the Resonance Structures**:
- Para-nitroso-nitrobenzene has a nitroso group (-NO) and a nitro group (-NO2) attached to a benzene ring. The resonance structures can be drawn by moving electrons around the ring and between the functional groups.

2. **Draw the Resonance Structures**:
- Draw the four possible resonance structures. Each structure will have different placements of double bonds and charges.

3. **Check the Octet Rule**:
- For each resonance structure, check if all atoms (especially carbon, nitrogen, and oxygen) satisfy the octet rule.
- Structures where atoms do not have a complete octet will be less stable.

4. **Evaluate Charge Distribution**:
- Analyze the charge distribution in each structure.
- Structures that have negative charges on electronegative atoms (like oxygen) and positive charges on electropositive atoms (like carbon) are generally more stable.

5. **Compare Stability**:
- Among the resonance structures that satisfy the octet rule, compare the stability based on charge distribution.
- The structure where the negative charge is on the electronegative atom (oxygen) and the positive charge is on the less electronegative atom (carbon) will be the most stable.

6. **Select the Most Stable Structure**:
- After evaluating all structures, select the one that meets both criteria of octet completion and favorable charge distribution.

### Conclusion:
The most stable resonating structure of para-nitroso-nitrobenzene is the one where all atoms have complete octets and the negative charge is on the oxygen atom, which is more electronegative.