All the lights in a brake light circuit illuminate ot one. The MOST likely use is: A. An open in the brake switch. B. A closed brake switch. C. A burned bulb. D. Excessive resistance in the circuit.

## Step 1<br />The problem is about a brake light circuit where all the lights illuminate simultaneously. This indicates that the circuit is functioning correctly, and there is no open circuit or excessive resistance.<br /><br />## Step 2<br />The options provided are:<br />A. An open in the brake switch.<br />B. A closed brake switch.<br />C. A burned bulb.<br />D. Excessive resistance in the circuit.<br /><br />## Step 3<br />Option A and D can be eliminated because they would result in the lights not illuminating at all, not all at once.<br /><br />## Step 4<br />Option B can also be eliminated because a closed brake switch would not cause all the lights to illuminate at once.<br /><br />## Step 5<br />Option C, a burned bulb, is the most likely cause. If one bulb is burned out, it can cause the other bulbs to illuminate at once due to the increased resistance in the circuit.