Comte and Mach had in common the belief that,

Comte and Mach had in common the belief that,

A. only overt behavior can be studied objectively
B. only the immediate conscious experience of a scientist can be studied
C. metaphysical speculation must be avoided
D. the only valid tool available for studying humans is introspection

Correct answer is option C. deindividuation. Explanation: Comte and Mach had in common the belief that, metaphysical speculation must be avoided.