Final answer:
According to the National Electrical Code, residential entrance cables must maintain a minimum clearance of 12 feet over residential driveways for safety reasons, making B. 12' the correct answer.
Step-by-step explanation:
The question regarding the minimum clearance over a driveway for residential entrance cables pertains to the standards outlined in the National Electrical Code (NEC). According to the NEC, residential entrance cables must maintain a minimum clearance of 12 feet over residential driveways, and this clearance is intended to ensure safety by reducing the risk of the cables being accidentally contacted by higher vehicles such as trucks that may use the driveway. This requirement is found in section 230.24(B) of the NEC. So, the correct answer to the question is B. 12'.