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Priyanshu kumar Best Answer
soft lewis bases contain larger, relatively polarizable donor atoms (such as P, S, and Cl).
https://chem.libretexts.org/Bookshelves/Inorganic_Chemistry/Modules_and_Websites_(Inorganic_Chemistry)/Coordination_Chemistry/Complex_Ion_Equilibria/Hard_and_Soft_Acids_and_Bases check this article
here all the given options are soft bases. but how to identify the polarisation of an atom?
see some examples...you have to remember some examples