Which carbocation is the most stabilized? (a) (b) GENERAL ORGANIC CHEMISTRY (c) (d)

In option (c) resonance will take place. The option (c) the positive charge is present next to a conjugated double bond system and these double bonds can come into conjugation with the positive charge. This conjugation results in delocalization of the positive charge making it much more stable than others. Hence, option (c) is the correct one.