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Math Question

13. A rotation about Point \( A \) maps Point \( B \) to \( B^{\prime} \) and Point \( C \) to \( C^{\prime} \). Which statement must be true? A. \( m \angle C^{\prime} A B^{\prime}=m \angle B^{\prime} A C \) B. \( m \angle C^{\prime} A C=m \angle B^{\prime} A B \) C. If Point \( B \) is \( (1,-2) \) then Point \( B^{\prime} \) must be \( -(1,2) . \) D. If Point \( C \) is \( (1,4) \) then Point \( C^{\prime} \) must be \( (-4,1) \)

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