You just chose the right answer. Pt is one of the exceptions of The Eighteen Electron Rule who do not always use 18 electrons, but often only 16 electrons.
(Phosphorus has 5 valence electrons, s²p³, but 3 valence electrons are used to bond to 3 Propyl-groups, so there are just 2 valence electrons left for the bonding with Fe. Br is a halogen and therefore gives just one valence electron.)

Pt          = 10e- (C6H5)   = 1e- 2 x PPr3 = 4e- Br          = 1e-  =====>  16e-

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