Change the following sentence into active voice by choosing the corre…

The correct answer is Option (2) - They have proved all his calculations wrong.

In the active voice, the subject performing the action is explicitly stated. In this case:

• The passive sentence "All his calculations have been proved wrong" is transformed into active voice by introducing the doer of the action (e.g., "they").
• "They" is a common generic subject in such sentences when the actual doer is not specified.
• "It has proved all his calculations wrong" - This assumes "it" as the doer, which is incorrect in the context.
• "We have proved all his calculations wrong" - This is active voice but alters the meaning by introducing "we" as the subject.
• "All his calculations were proved wrong" - This is still in passive voice.