Find the measurement of ∠1. Justify your answer.
A. m ∠1 = 75 because corresponding angles of parallel lines are congruent.
B. m ∠1 = 75 because corresponding angles of parallel lines are supplementary.
C. m ∠1 = 105 because corresponding angles of parallel lines are congruent.
D. m ∠1 = 105 because corresponding angles of parallel lines are supplementary.
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