Single/multi-select question: Does the sentence "The pre-Socratic philosopher Thales (640-546 BC), dubbed the "father of science", was the first to postulate non-supernatural explanations for natural phenomena, for example, that land floats on water and that earthquakes are caused by the agitation of the water upon which the land floats, rather than the god Poseidon." provide a valid answer to the question "What question were Greek philosophers trying to answer?"
Choices: (a). yes; (b). no;
(b).