The supplied 1979 quiz and supporting article both publish Renny Roker.
The known series-level erroneous form Renny Rocker is not present in these supplied 1979 records.
Disposition: Preserve Renny Roker exactly and document that the known name issue was checked.
The source first names Toby Henderson and Jeff Bottema, then refers to the pair as “the ‘Coca-Cola Cowboy’ and Bottema.”
Disposition: Verified answer: Toby Henderson. Mark as contextually attributed rather than quoted in a standalone identification sentence.
The supplied article identifies Sal Zuener, Toby Henderson, and Jeff Bottema as DG riders. Harry Leary is the only listed option not identified with DG.
Disposition: Verified answer: D. Harry Leary. Mark as an evidence-supported exclusion.
The quiz asks about the Jag World Championship Series. The article says Renny Roker directed Jag BMX, which sponsored and put on the first Jag World Championships, and that it became a short tradition.
Disposition: Verified answer: B. Renny Roker. Preserve and document the wording difference.
All five main questions and the extra-credit question are supported by the supplied article spread. No external answer key was needed or invented.
The archive documents what is visible in the supplied quiz, article spread, and live-page capture. Historical statements are preserved as published and are not represented as independently corroborated beyond the supplied evidence.