(A) Lewis base is defined as a species that can donate a lone pair of electrons. $BF_{3}$ is an electron-deficient molecule with an incomplete octet o

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(A) Lewis base is defined as a species that can donate a lone pair of electrons. $BF_{3}$ is an electron-deficient molecule with an incomplete octet on the central boron atom,making it a Lewis acid,not a Lewis base. $NH_{3}$,$H_{2}O$,and $OH^{-}$ all possess lone pairs of electrons that they can donate,thus acting as Lewis bases.