What did Marx (1997) mean when he suggested that “intellectual puzzles and contradictions” can be a possible source of research questions?

(A) The researcher may feel that there is a contradiction in the literature, presenting a “puzzle” to be solved
(B) Students can develop their IQ levels by attempting to solve intellectual puzzles
(C) Unless you can find a logical contradiction, you have no basis for conducting research
(D) All of life is a puzzle, so any aspect of life can be researched