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$$\mathrm{A}$$ is a primary carbocation whereas $$\mathrm{B}$$ is a secondary carbocation.
Since the order of stability of carbocations is as follows:
$$\mathrm{3^\circ > 2^\circ > 1^\circ > CH_3^+}$$
$$\mathrm{B}$$ is more stable than $$\mathrm{A}$$.
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