Enthalpy is an extensive state function, rather than an intensive property or a path-dependent quantity. What follows from this distinction when constructing a Hess cycle to calculate an unknown reaction enthalpy?

C. Step values scale with stoichiometric multipliers but ignore the route taken

Confusing extensive properties with intensive ones leads to omitting stoichiometric multipliers, whilst treating enthalpy as path-dependent denies Hess's law entirely. Enthalpy behaves like altitude: independent of the route, but strictly proportional to quantity.