Correct Answer: All efficient workers are being given a promotion by the company.

Solution : The first option is the correct choice.

In the original sentence, "The company is giving a promotion to all efficient workers," the subject is "The company," and the verb is "is giving."

To convert this into the passive voice, we follow the structure: Object + Verb + Subject.

The passive construction starts with the object, which becomes the new subject in the passive voice. Additionally, the verb "is giving" becomes "is being given" in the passive form. The prepositional phrase "to all efficient workers" remains unchanged in its position in the sentence.

Therefore, the answer will be: All efficient workers are being given a promotion by the company.