Final answer:
C) The Enlightenment.
The Enlightenment is a possible turning point from pursuing heresy to practical investigations, as it focused on science over theological doctrine.
Step-by-step explanation:
A possible turning point when transitioning from the theological pursuit of heresy to a practical pursuit is C) The Enlightenment. This era in the 18th century signified a marked shift from religious to scientific and rational exploration. Figures like Yacob and Copernicus had already laid the groundwork, challenging religious authorities with reason and scientific observation. Subsequently, governments began to systematically support these methods of inquiry, fueling the process often referred to as modernization, which diverged from the traditional theological power structures.