In the Parable of the Talents (Matthew 25:14-30), what is the primary interpretation concerning the master's commendation of the servants who doubled their talents?

A A reward for innate ability rather than effort. B Divine grace is given equally to all, regardless of their actions. C Faithfulness and diligent effort in using entrusted gifts will be rewarded. D Accumulation of wealth is inherently virtuous and pleasing to God.