Which topic,previously considered unanswerable,has now emerged as a target of research?

Question

​Which topic,previously considered unanswerable,has now emerged as a target of research?

Quizplus · Accepted Answer

The question of what brain processes are associated with consciousness was previously considered unanswerable, but has now emerged as a target of research in the neurosciences. A and C are also of interest to researchers, but are not as current or widely studied as the topic of consciousness. D is not a target of scientific research as it concerns an untestable proposition.

​Which Topic,previously Considered Unanswerable,has Now Emerged as a Target of Research

Which Topic,previously Considered Unanswerable,has Now Emerged as a Target of Research