Question

adjustable wrench
the adjustable wrench, sometimes referred to as a \crescent wrench\ (made popular by the brand name crescent) can be set to the size of the bolt or nut, by turning the spindle. this ty wrench is often used for large bolts and nuts, or when the correct size wrench is unavailable.
a well - fitting box - end or open - end is always preferable over an adjustable wrench; because du to its adjustable design, there will always be a certain amount of free play. this play can cause th adjustable wrench to lose grip, resulting in the wrench slipping off the bolt or nut. when this happens, both the tool and the nut or bolt can be damaged.
what is special about the adjustable wrench?
the adjustable wrench renders other wrenches obsolete.
the adjustable wrench accommodates a number of sizes, by using an adjustable spindle.
the adjustable wrench is suitable to loosen bolts that are very tight.

Explanation:

1. Analyze the first option: The text says a well - fitting box - end or open - end is preferable over an adjustable wrench, so it does not render other wrenches obsolete. Eliminate this option.
2. Analyze the second option: From the text "The adjustable wrench... can be set to the size of the bolt or nut, by turning the spindle", this option matches the description of the adjustable wrench's special feature.
3. Analyze the third option: The text does not mention that the adjustable wrench is suitable for loosening very tight bolts. Eliminate this option.

Answer:

The adjustable wrench accommodates a number of sizes, by using an adjustable spindle.