To determine which sentence correctly uses parallel structure, we need to analyze each sentence to ensure that the elements in the series are grammatically and structurally consistent. Parallel structure requires that items in a list or series are presented in the same grammatical form.

Let’s analyze each sentence:

“The boss wants to know who can take the late shift tonight, open tomorrow morning, and who can work on the holiday.”

This sentence is not parallel because “open tomorrow morning” is not in the same form as “who can take the late shift tonight” and “who can work on the holiday.” The verb “open” should be “who can open” to match the structure of the other items.

“The boss wants to know who wants the late shift tonight, who can open tomorrow morning, and if you will work on the holiday.”

This sentence is not parallel because “if you will work on the holiday” is not in the same form as “who wants the late shift tonight” and “who can open tomorrow morning.” It should be “who wants to work on the holiday” to match the structure.

“The boss wants to know who can take the late shift tonight, who can open tomorrow morning, and who can work on the holiday.”

This sentence is parallel because all items (“who can take the late shift tonight,” “who can open tomorrow morning,” and “who can work on the holiday”) are in the same form, using “who can” followed by the action.

“The boss wants to know who can take the late shift tonight, who can open tomorrow morning, and which of us wants to work on the holiday.”

This sentence is not parallel because “which of us wants to work on the holiday” is not in the same form as “who can take the late shift tonight” and “who can open tomorrow morning.” It should be “who can work on the holiday” to match the structure.

Final Answer

The sentence that correctly uses parallel structure is:

“The boss wants to know who can take the late shift tonight, who can open tomorrow morning, and who can work on the holiday.”