Active sentences in the simple past tense have the following structure: Subject + past tense form of the verb + object Passive sentences in the simple past tense have the following structure: Object of the active sentence + was/were + past participle form of the verb + by + subject of the active sentence
B. The homework is being completed by the students.
C. The homework has been completed by the students.
D. None of these
Explanation
The homework has been completed by the students.
In passive voice, the focus shifts to the object, and "has been" is used with the past participle to show the homework was completed by the students recently.
A. 350 runs were scored by our team in the Inter-college Cricket Tournament.
B. 350 runs were scoring our team in the Inter-college Cricket Tournament.
C. 350 runs have been scored by our team in the Inter-college Cricket Tournament.
D. None of these
Explanation
350 runs were scored by our team in the Inter-college Cricket Tournament.
In passive voice, the object of the active sentence becomes the subject, and the verb is in the past participle form, making "were scored" the correct construction.