The most credible and reliable support for the argument in favor of lowering the age to get a driver’s license to 14 years of age would be "A national news broadcast reports that in South Dakota, teenagers as young as 14 years old can receive their restricted driver’s permits."
This piece of evidence is strong because it references a specific policy in a state, demonstrating real-world precedent for allowing younger drivers to obtain permits. It implies that there have been successful implementations of such a law, which can help bolster the argument. In contrast, the other responses are primarily anecdotal or subjective in nature and do not provide the same level of objective support.