When driving in rain, you must:

1. Use low beam headlights. ✓
2. Use high beam headlights.
3. Use parking lights.
4. Use no lights.

Answer: A. Use low beam headlights.

When driving in rain, you must use low beam headlights.

Why this is the answer

The Texas handbook's list of when to use low beam headlights includes driving in fog, heavy rain, sleet, snow, or dust. That directly matches the question about driving in rain. The same list also covers following closely and approaching vehicles, but the rain item is enough here. Because the handbook names low beams for heavy rain, the correct choice is to use low beam headlights.

Why the other answers are wrong

• B. Use high beam headlights. — The handbook's low-beam list includes heavy rain, so high beams are not the choice it gives for rain.
• C. Use parking lights. — The passage mentions parking lights only for parking on an unlighted highway at night, not for driving in rain.
• D. Use no lights. — The handbook says low beams are used in heavy rain, so driving with no lights does not match its rule.

Remember it

Think "bad weather, low beams" — when rain cuts visibility, the handbook puts you on the low-beam setting.