JAMB Use of English 1979 Question 68

Choose the option nearest in meaning to the underlined statement: My Headmaster is getting old. His mates have been retired. But because of his zeal for work he has been retained.

1. A.My Headmaster is strong
2. B.My Headmaster is cheerful
3. C.My Headmaster is friendly
4. D.My Headmaster is enthusiastic about his job
5. E.My Headmaster's activity at work is unparalleled