When the Oxidation-Reduction Reaction Shown Here Is Balanced Using the Smallest

When the oxidation-reduction reaction shown here is balanced using the smallest whole-number coefficients,how many moles of electrons are transferred? CH₄(g) + K₂SO₄(aq) $\to$ HCO₃(aq) + KHS(aq) + H₂O( )

A) 8
B) 6
C) 4
D) 2
E) 1