| 1 | A | B | C | D |
| --- | --- | --- | --- | --- |
| 2 | List of Trans-AMA motocross champions - Trans-AMA champions |  |  |  |
| 3 | Year | Rider | Country | Machine |
| 4 | 1970 | Dave Nicoll | United Kingdom | BSA |
| 5 | 1971 | Sylvain Geboers | Belgium | Suzuki |
| 6 | 1972 | Åke Jonsson | Sweden | Maico |
| 7 | 1973 | Adolf Weil | West Germany | Maico |
| 8 | 1974 | Roger De Coster | Belgium | Suzuki |
| 9 | 1975 | Roger De Coster | Belgium | Suzuki |
| 10 | 1976 | Roger De Coster | Belgium | Suzuki |
| 11 | 1977 | Roger De Coster | Belgium | Suzuki |
| 12 | 1978 | Bob Hannah | United States | Yamaha |

Question: Who won the most Trans-AMA motocross series and how many did they win?
Answer: Roger De Coster was a four-time winner of the Trans-AMA motocross series.