In the Parable of the Unjust Steward (Luke 16:1-13), what is the primary theological lesson Jesus intends to convey through the steward's shrewdness, despite his dishonesty?

A That dishonesty is acceptable if it leads to personal gain. B That worldly wisdom should be completely rejected by believers. C That believers should use their resources wisely and purposefully, even if those resources are of questionable origin, to secure their eternal future. D That material wealth is inherently evil and should be avoided at all costs.