m<AFB + m<BFC + m<CFD = m<AFD
m<AFB = m<CFD = 31; m<AFD = 90
31 + m<BFC + 31 = 90
m<BFC + 62 = 90
m<BFC = 28
m<CFE = m<CFD + m<DFE
m<DFE = m<BFC = 28
m<CFE = 31 + 28
m<CFE = 59
Answer: C. 59