Ted Was Bored by School, So His Grades Were Poor

Ted was bored by school, so his grades were poor throughout primary and secondary school. He eventually dropped out and started a business rebuilding classic cars with modern engines. Ted's business is very successful, and he loves what he does. Is Ted intelligent?

A) No. Good grades are the best indicator of intelligence.
B) Yes. People who are bored in school invariably have genius-level IQs.
C) No. Ted has not demonstrated an ability to acquire knowledge, reason effectively, and adapt to his environment.
D) Yes. Ted has demonstrated an ability to acquire knowledge, reason effectively, and adapt to his environment.