Answer :
The question requires we complete the sentence using one of the options given.
He wanted someone to take up his role once he retired.
The statement above is illustrating a situation where an employee is thinking about his retirement. The employee is thinking about someone to take up his role when he retires.
The person to take over from him should be an hardworking and honest who understands the role of the employee vividly. Somebody the employee can trust about his role when he retires.
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