In which sentence is the word books used as a direct object? a. move those books off the piano immediately. b. will books be replaced by computers? c. jermaine filled the shelves in his room with books. d. whenever possible, mrs. montoya books an early flight.

The answer would be: A) Please move those books off the piano immediately.

An indirect object is the receiver of the action of a verb  

So in this case, "Move" those books.

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In which sentence is the word books used as a direct object?

A. Please move those books off the piano immediately.

A direct object is preceded by a transitive verb, which in sentence A would be move.  This verb is the action verb which answers the what or who question. In this case would be: What is going to be moved? The books off the piano...

The remaining sentences use the word books differently. Sentence B uses books as the subject; sentence C as an indirect object (the word shelves would be the direct object). Finally, sentence D uses books as a possessive noun.    

the dictionary definition of ubiquitous is "present, appearing, or found everywhere".