Final answer:
Buried wire should typically be placed 18 inches deep under parking or driveways and 6 inches deep under landscaping, making option (a) the closest match to common guidelines.
Step-by-step explanation:
The depth at which buried wire should be placed under parking or driveways and under landscaping varies based on local codes and utilities practices. However, a common guideline suggests that the wire should be 18 inches under parking or driveways and 6 inches under landscaping. Therefore, the correct answer to the question is: Buried wire should be 18 feet under parking or driveways and 6 feet under landscaping. Option (a) 12, 18 inches is the closest match to these guidelines.