The passive voice in which the sentences are rewritten correctly is in option (D): "Dr. Bender added sulfur to the mixture."
What is passive voice?
Many languages use grammatical voice constructions known as the passive voice. The grammatical subject of a clause in the passive voice expresses the topic or patient of the primary verb, i.e., the subject of the action or the object whose condition is altered. roles played by the passive voice.
The passive voice is used to express interest in the subject of an action rather than the subject or object that actually performs it. In other words, the most significant object or someone becomes the sentence's topic.
Passive voice tends to disguise or de-emphasize the sentence's actor, whereas active voice tends to highlight or disclose it. Accordingly, active phrases frequently sound more "direct" than passive ones, making them more understandable to the reader.
Passive voice is used when the actors of the sentence are unknown or irrelevant, or talk in general form, or vague. Therefore, out of the given choice, option (D) is the correct one.
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