B
First, produce two lines (G , H ) passing through C and D respectively which are parallel to AB and FE
Suppose GC // HD // AB // FE
angle HDE = 180-26 (interior angles, FE//HD)
angle HDE = 154
angle HDC = 267-154
angle HDC = 113
angle GCD = 180-113(interior angles, GC//HD)
angle GCD = 67
angle BCG = 180-143(interior angles, GC//AB)
angle BCG = 37
therefore, x = 67+37
= 104