How many milliliters are contained in 1 liter?

One liter is equivalent to 1000 milliliters, which is a standard metric conversion that reflects the relationship between these two units of volume. The metric system is based on powers of ten, and understanding this system helps in conversions like this. Therefore, when converting liters to milliliters, you multiply the number of liters by 1000 since "milli" means one-thousandth. This means that 1 liter contains 1000 milliliters, confirming that the choice provided is the correct answer. The other options reflect smaller volumes in milliliters, which do not accurately represent the conversion from liters.