Which of these lights cannot be checked alone?

Brake lights.. Section 2.1: It is difficult to check brake lights alone unless you wedge the pedal or use a reflection. The others can be

Which of these lights cannot be checked alone?

ANSWER BREAKDOWN
  • A. Incorrect. "Headlights." is not correct. It is difficult to check brake lights alone unless you wedge the pedal or use a reflection. The others can be switched on and checked.
  • B. Incorrect. "Turn signals." is not correct. It is difficult to check brake lights alone unless you wedge the pedal or use a reflection. The others can be switched on and checked.
  • C. Correct. It is difficult to check brake lights alone unless you wedge the pedal or use a reflection. The others can be switched on and checked.
  • D. Incorrect. "Four-way flashers." is not correct. It is difficult to check brake lights alone unless you wedge the pedal or use a reflection. The others can be switched on and checked.