(B) Ethylene glycol $(HOCH_2-CH_2OH)$ reacts with $PI_3$ to form $1,2$-diiodoethane $(ICH_2-CH_2I)$.$1,2$-diiodoethane is unstable and undergoes elimi

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(B) Ethylene glycol $(HOCH_2-CH_2OH)$ reacts with $PI_3$ to form $1,2$-diiodoethane $(ICH_2-CH_2I)$.$1,2$-diiodoethane is unstable and undergoes elimination of $I_2$ to form ethylene $(CH_2=CH_2)$.The overall reaction is: $HOCH_2-CH_2OH + PI_3$ $\rightarrow ICH_2-CH_2I$ $\rightarrow CH_2=CH_2 + I_2$.