Final answer:
A teen driver with a learner's permit may drive when accompanied by a licensed adult driver. Specific conditions can vary by state, but an adult in the passenger seat is a common requirement.
Step-by-step explanation:
A teen driver with a learner's permit may drive under specific conditions mandated by state law. The conditions can vary depending on the state, but generally, one common condition is that the learner must be accompanied by a licensed adult driver, often someone who is 21 years of age or older. This is meant to ensure that a more experienced driver is able to provide guidance and take control if necessary.
Therefore, the correct answer to what condition allows a teen driver with a learner's permit to drive is: B. there is a class C license adult driver in the passenger seat. The day, weather conditions, or the presence of other drivers on the road do not typically constitute specific conditions for driving with a learner's permit.