in the equation $ch_4 + o_2 \to co_2 + h_2o$, what is unbalanced?\na. hydrogen atoms\nb. carbon atoms\nc…

in the equation $ch_4 + o_2 \to co_2 + h_2o$, what is unbalanced?\na. hydrogen atoms\nb. carbon atoms\nc. both hydrogen and oxygen atoms\nd. oxygen atoms