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B) Centimeter

The most appropriate unit for measuring the length of a standard pencil is the centimeter. This unit is suitable because it provides a convenient scale for everyday objects that are typically several centimeters long.

A) Millimeter

Millimeters are too small of a unit for measuring the length of a standard pencil, which usually ranges from about 15 to 20 centimeters. While useful for finer measurements, millimeters would not provide a practical representation of a pencil's length.

B) Centimeter

Centimeters are ideal for measuring the length of a standard pencil, as they allow for an accurate and understandable measurement. A typical pencil length of around 18 centimeters fits well within this unit, making it both practical and easy to visualize.

C) Meter

Using meters to measure the length of a standard pencil would be impractical, as it is a larger unit more suited for measuring longer distances. A pencil's length, being much shorter than a meter, would require cumbersome decimal representations, which are not user-friendly.

D) Kilometer

Kilometers are far too large a unit for measuring the length of a standard pencil. This unit is reserved for measuring much greater distances, such as those found in geography, making it completely inappropriate for the context of a pencil's length.

Conclusion

Centimeters are the most appropriate unit for measuring the length of a standard pencil due to their suitability for everyday objects of this size. Other options, such as millimeters, meters, and kilometers, either fail to provide a practical measurement or are too large for this specific context. Thus, option B is definitively the correct choice.