Identify the correct statements with reference to the given...

Write the O.N. of each element above its symbol, then (\$stackrel{0}{\mathrm{P}_4}+$3 \stackrel{-2+1}{ \mathrm{\text{ OH }}^{-}}+3 $\mathrm{H}_{2}^{+1-2} \stackrel{-3+1}{\mathrm{O}^{-3+1}} \rightarrow \stackrel{+1}{\mathrm{PH}_3}+3$\mathrm{H}_{2}\stackrel{+1}{\mathrm{PO}_{2}^{-}})$In$this reaction, (\mathrm{O} . \mathrm{N}). of P increases from O in ($\mathrm{P}_{4}$ to +1 in ($\mathrm{H}_{2}$\mathrm{PO}_{2}$^{-})and decreases to -3 in (\mathrm{PH}_{3}), therefore, P undergoes both oxidation as well as reduction. Thus, options (a) and (b) are wrong and option (c) is correct. Further, O .N. of H remains +1 in all the compounds, i.e., H neither undergoes oxidation nor reduction. Thus, option (d) is correct.