Given ∠ ABC and ∠ DEF are supplementary and ∠ ABC and ∠ GHJ are supplementary, what can you conclude?

A. m∠ DEF+m∠ GHJ=90°
B. m∠ DEF=m∠ GHJ
C. m∠ DEF+m∠ GHJ=180°
D. m∠ ABC ≌ ∠ ∠ DEF and m∠ ABC≌ m∠ GHJ