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# The hybridisation and geometry of $SO_4^{2-}$ respectively

$\begin{array}{1 1}(a)\;sp^2,\text{trigonal planar}&(b)\; sp^3,\text{trigonal planar}\\(c)\;sp^3,\text{tetrahedral}&(d)\;dsp^2,\text{square planar}\end{array}$

$sp^3$ hybridisation & tetrahedral shape.
Hence (c) is the correct answer.