Final answer:
The distance the bookcase is moved is not provided, so we cannot determine the work done.
Step-by-step explanation:
To calculate the work done in moving the bookcase, we can use the formula:
Work = Force × Distance
Given that the force applied is 300 N and the bookcase is moved, we need to determine the distance it is moved. Unfortunately, the question does not provide this information, so we cannot accurately calculate the work done.
Therefore, we cannot determine the correct answer choice from the given options.