Ozonolysis of 2,3-dimethyl-1-butene followed by reduction with zinc and water gives

$\begin{array}{1 1}(a)\;\text{Methanoic acid and 3-methyl-2-butanone}\\(b)\;\text{Methanal and 2-methyl-2-butanone}\\(c)\;\text{Methanal and 3-methyl-2-butanone}\\(d)\;\text{Methanoic acid and 2-methyl-2-butanone}\end{array}$

Hence (c) is the correct option.