GMAT Critical Reasoning (CR) | An antidote for chicken pox has been developed

An antidote for chicken pox has been developed, but
researchers warn that its widespread use could be
dangerous, despite the fact that this drug has no
serious side effects and is currently very effective at
limiting the duration and severity of chicken pox.

Which one of the following, if true, helps most to
reconcile the apparent discrepancy indicated above?

(A) The drug is extremely expensive and would be
difficult to make widely available.
(B) The drug has to be administered several times
a
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