Convert the given sentence into active/passive voice. **Change the following from active to passive: Researchers have been investigating the long-term psychological impact of social isolation on adolescents.**

Options:

• A: The long-term psychological impact of social isolation has been investigated on adolescents by researchers.
• B: The long-term psychological impact of social isolation on adolescents has been being investigated by researchers.
• C: The psychological impact had been investigated by researchers on adolescents.
• D: Social isolation impacts on adolescents have been investigated by researchers.

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