[单选题]
A traffic light of wei zoc. u/q,j9gmght 100 N is supported by told;r+l*o9 3m+p-1 tso mylgmb 2t)jbwo ropes as shown in Fig. 4-2. What are the tensions in the ropeso;2+s j b lo )lblr pm9tyg*tdm3m-o1+?
A. $50 \; N$
B. $63 \; N$
C. $66 \; N$
D. $83 \; N$
