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Since interior angles of a triangle add up to 180 degree, we get
[tex]\angle KMN+\angle KNM+\angle NKM=180[/tex]since angle NKM =39 and angle KNM = 75, we have
[tex]\angle KMN+75+39=180[/tex]which gives
[tex]\begin{gathered} \angle KMN+114=180 \\ \angle KMN=180-114 \\ \angle KMN=66 \end{gathered}[/tex]therefore, the answer is option B.
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