The correct answer is option A:
Dangerous potion was drunk by the child mistakenly.
Here is a detailed explanation of why option A is the correct answer:
1.
Subject-Verb Agreement: In the given sentence, the subject is "child" and the verb is "drunk." They need to agree in terms of number and tense. The subject "child" is singular, so the verb should be in the singular form "was drunk."
2.
Passive Voice: The sentence is written in the passive voice, which means that the object (dangerous potion) is the focus of the sentence rather than the subject (child). This is indicated by the use of the word "by" followed by the doer of the action (child) in the sentence.
3.
Tense: The verb "drunk" is in the past participle form, indicating that the action has already been completed in the past.
4.
Adverb Placement: The adverb "mistakenly" is placed correctly in the sentence to modify the action of drinking the potion. It describes how the child drank the potion.
In contrast, let's review why the other options are incorrect:
- Option B:
Dangerous potion were drunk by the child mistakenly.
- The verb "were drunk" does not agree with the singular subject "child." It should be "was drunk."
- Option C:
Dangerous potion had drunk by the child mistakenly.
- The verb "had drunk" is in the wrong tense. It implies that the action of drinking the potion happened before another past event, which is not indicated in the sentence.
- Option D:
Dangerous potion drunk by the child mistakenly.
- This sentence is missing a helping verb to form a complete passive construction. The correct form should be "was drunk" instead of just "drunk."
Therefore, option A is the correct answer as it maintains subject-verb agreement, uses the passive voice, and correctly places the adverb "mistakenly."