(B) Lewis base is defined as a substance that can donate an electron pair.In the reaction $BCl_3 + PH_3 \rightarrow Cl_3B^{-}PH_3$,the phosphorus atom

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(B) Lewis base is defined as a substance that can donate an electron pair.In the reaction $BCl_3 + PH_3 \rightarrow Cl_3B^{-}PH_3$,the phosphorus atom in $PH_3$ has a lone pair of electrons.$PH_3$ donates this lone pair to the electron-deficient boron atom in $BCl_3$ to form a coordinate covalent bond.Therefore,$PH_3$ acts as the Lewis base.