First we have to find the inner angles of the triangle.
The top angle would be 180 - 131 which is 49 degrees.
The angle on the right side of the triangle would be 180 - 160 which is 20
To find the third angle, we must subtract the other angles of the triangle by 180.
180 - 20 - 49 = 111 degrees.
n is 180 - 111 which is 69 degrees.
Therefore, the answer is B. 69°