Decreasing order of hydride affinity for carbocations:

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Step 1: Hydride Affinity and Carbocation Stability
Hydride affinity is the tendency of a carbocation to accept a hydride ion. It is inversely proportional to the stability of the carbocation. The more stable the carbocation, the lower its affinity for hydride.
- (D): Tricyclopropylmethyl cation (Exceptionally stable due to 'dancing resonance'). Lowest affinity.
- (B): Triphenylmethyl cation (Stable due to resonance with three rings).
- (A): Allic/tertiary stabilized cation.
- (C): tert-butyl cat

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