should be A. because 36 plus 144 is 180, and that is the degree of the straight line that both the degrees are on. Hope this helps, whymenotsmart^m^.
The top angle in he triangle is 180o - 121o = 59o.
The angle in the right corner of the triangle is 180o - 144o = 36o.
This means that the angle in the left corner of the triangle is 180o - (59o + 36o) = 85o
To find the value of no: no = 180o - 85o = 95o.