Answer :
Final answer:
In the metric system, the unit used to measure liquid volume is B. Liter.
Explanation:
The metric system, which is used globally for scientific and everyday measurements, has specific units designated for different types of measurements. Each of these units has a clear and defined purpose.
Option A, the Meter, is the fundamental unit of length in the metric system. It is used to measure distance, from microscopic sizes (like millimeters) to more substantial distances (like kilometers).
Option B, the Liter, is specifically designed to measure volume, particularly for liquids. Whether it's water, oil, or any other liquid, the liter and its sub-units (like milliliters) provide a consistent and universal way to express its quantity. A liter of water, for example, is defined as a volume of 1,000 cubic centimeters (cm^3) at its maximum density.
Option C, the Gram, is the metric unit for mass. It's used to weigh various substances, from foods to chemicals. Just like the other units, it can be scaled up or down using prefixes like kilograms (for larger weights) or milligrams (for smaller weights).
Option D, the Grain, is not a unit in the metric system at all. Instead, it's an old unit of mass that is commonly used in the context of measuring the weight of precious metals, gemstones, or medication doses in some countries.
In summary, while the metric system offers specific units for a range of measurements when it comes to measuring the volume of liquids, the liter is the designated and appropriate unit.
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