What is the author's attitude toward Hering's theory

A．are lack of differentiation in quality
B．are similar in size, number, and arrangements
C．reveal qualitative diversity
D．spasmodically pass through the nervous system

A．scientists have reached a consensus on the relationship between brain processes and mental experience
B．variations in nerve cells are proved to be significantly correlated with mental experience
C．attempts to correlate mental experience with brain processes have been viewed with pessimism
D．scientists are indifferent to the manifold dimensions of mental experience