Select the correct passive form of the given sentence.

The counsellor gave very good advice to the students.

Very good advice was given to the students by the counsellor.

The correct passive form of the given sentence "The counsellor gave very good advice to the students" is Very good advice was given to the students by the counsellor.

The other options are incorrect because:

• Very good advice to the students has been given by the counsellor uses the present perfect tense, while the original sentence is in the simple past tense.
• Very good advice to the students had been given by the counsellor uses the past perfect tense, which is not typically used for actions that happen regularly.
• Very good advice is given to the students by the counsellor uses the present tense, while the original sentence is in the simple past tense.
• Very good advice to the students is being given by the counsellor uses the present progressive tense, which is not typically used for actions that happen regularly.