Question

(active to passive )He has established a sound business​

Answer 1

Answer:

a sound business has been established by him

Answer 2

Answer:

A sound business has been established by him.

This is the most correct answer of this question.

This sentence is in present perfect tense and in active voice.

To transform this kind of sentences of present perfect tense in active voice to passive voice. we should follow this rule: { object + have/has + been + past participle form of the verb i.e. V3 + by + subject.}