Select the option that expresses the given sentence in active voice.
By whom have the problems been solved?
- AWho has solved the problems?
- BWhose problems were solved?
- CWho solved the problems?
- DWho solves the problems?
Solution & Step-by-step Explanation
The given interrogative sentence is in the passive voice of the present perfect tense.
The passive structure for present perfect interrogative sentences starting with "By whom" is:
By whom + have/has + Object + been + Past Participle (V
3
)?
The active voice structure for this starts with "Who":
Who + has/have + Past Participle (V
3
) + Object?
Passive: By whom + have + the problems + been + solved?
Active: Who + has + solved + the problems? (Note: "Who" takes a singular verb "has" here as the subject pronoun).
Hence, option A is the correct active conversion.
The passive structure for present perfect interrogative sentences starting with "By whom" is:
By whom + have/has + Object + been + Past Participle (V
3
)?
The active voice structure for this starts with "Who":
Who + has/have + Past Participle (V
3
) + Object?
Passive: By whom + have + the problems + been + solved?
Active: Who + has + solved + the problems? (Note: "Who" takes a singular verb "has" here as the subject pronoun).
Hence, option A is the correct active conversion.