Select the correct passive form of the given sentence. Re

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M: +3.00/-0.00

Select the correct passive form of the given sentence.

Researchers have found that employees who have friends at the office are generally happier in their job.

[SSC Stenographer 8th Feb 2019 Shift-II]

A It was found by researchers that employees who have friends at the office are generally happier in their job.

B It could be found by researchers that employees who have friends at the office are generally happier in their job.

C It is being found by researchers that employees who have friends at the office are generally happier in their job.

D It has been found by researchers that employees who have friends at the office are generally happier in their job.