What is the expression for Kc for the following reaction: 2C₂H₄(g)+2H₂O(g)⇌2C₂H₆(g)+O₂(g)"
a) [C₂H₆]²/[C₂H₄]²[H₂O]²[O₂]
b) [C₂H₆][O₂]/[C₂H₄]²[H₂O]²
c) [C₂H₆][O₂]/[C₂H₄][H₂O]²
d) [C₂H₆]²[O₂]/[C₂H₄]²[H₂O]²