Based on the information provided and common regulations regarding driver education courses and learner permits, the correct answer would typically be:
C. $17 \frac{1}{2}$ ; $15 \frac{1}{2}$
This option indicates that new drivers who are younger than 17 and a half years old and older than 15 and a half years old must complete a driver education course to receive a learner permit. However, it's essential to check specific state laws, as requirements can vary.