Considering the parable of the Unjust Steward (Luke 16:1-13), what is the central lesson Jesus is teaching about worldly wealth and eternal investments?

A That it is acceptable to be dishonest in small matters if it benefits you in the long run. B That Christians should strive to accumulate as much wealth as possible to prove their faithfulness. C That we should use worldly wealth wisely and generously to gain eternal rewards, recognizing its temporary nature. D That it's impossible to serve both God and money, so we must abandon worldly possessions.