An exterior angle of a triangle is $105^{\circ}$ and its two interior opposite angles are equal. Each of these equal angles is
- A${37 \frac{1}{2}}^{\circ}$
- B$75^{\circ}$
- C${72 \frac{1}{2}}^{\circ}$
- D${52 \frac{1}{2}}^{\circ}$
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