(B) 52 ½o
Explanation:
According to the question,
Exterior angle of triangle= 105°
Let the two interior opposite angles of the triangle = x
We know that,
Exterior angle of a triangle = sum of interior opposite angles
Then, we have the equation,
105° = x + x
2x = 105°
x = 52.5°
x = 52½
Therefore, option (B) is the correct answer.