AAMC practice test 6 question

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Jul 13, 2012
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An active halide such as Ar3CX directly reacts with an alcohol with no need for an alkoxide ion because the halide ion undergoes solvolysis to form:
a) a carbanion
b) a carbene
c) a free radical
d) a carbocation

Answer:The aromatic halide Ar3CX (“Ar” = aryl or aromatic; for example, Ph3CX) is not only a tertiary halide (favoring
carbocation formation), but the resultant carbocation is stabilized by resonance with the three aromatic rings. Therefore,
Ar3CX readily forms a carbocation to undergo SN1 reactions with alcohols.

Can someone explain why it's D to me? I thought aromatic halides with unreactive towards nucleophilic substitution reactions (such as SN1) and undergo electrophilic substitution instead.
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