Which diagram best shows how fraction bars can be used to evaluate 1/2 divided by 1/4?

The second option is the best representation of the question.
Fractions represent equal parts of a whole or a collection.
Explanation:
The whole quantity = 1
Divide this whole by 4 and separate it into four equal parts of 1 / 4
Combine two of these four parts to make 1 / 2
Hence, the second option is the best representation of the given question.
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