Correct option is C

Angle in a quadrilateral = 360°
=> ∠ MON + ∠ ONT + ∠ MTN + ∠ TMO = 360°
=> 105° + 90° + 90° + ∠ MTN = 360°
=> ∠ MTN = 75° .

Angle in a quadrilateral = 360°
=> ∠ MON + ∠ ONT + ∠ MTN + ∠ TMO = 360°
=> 105° + 90° + 90° + ∠ MTN = 360°
=> ∠ MTN = 75° .
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