There are no scalar interaction vertices in the theory as written. The canonical Kähler term supplies kinetic terms, the constant superpotential supplies none, and the soft term is only a two-point mass insertion with Feynman rule in Minkowski conventions. Hence no interaction diagram involving only scalar components exists.
The Yukawa matrix is , which vanishes for constant . Therefore there is no scalar-fermion interaction vertex and no corresponding Feynman diagram. The requests in parts (vi)(a) and (vi)(b) would become nontrivial only after changing the field content or reducing the symmetry so that a nonzero invariant superpotential exists.
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