Most stable carbocation:

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Canvas Classes · Accepted Answer

Step 1: Evaluating Resonance and Extended Conjugation
Carbocation stability increases with the extent of delocalization.
- Structure (d): The positive charge is in conjugation with two double bonds and an electron-donating methoxy group () at the far end. This extended conjugation allows for maximum delocalization. Most stable.
- Other structures have shorter conjugation paths or less stabilization.

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