10. In the adjoining figure, $l \parallel BC$ and AB and AC are the transversals. If $\angle 2 = \angle 3$ and $\angle 1 = \frac{1}{4}\angle 2$, then the measure of $\angle B$ is (a) $80^\circ$ (b) $70^\circ$ (c) $72^\circ$ (d) $76^\circ$
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