The _________ hunters used progressively smaller tools with diminutive two-sided blades and tiny microliths.

Correct option is D

 The Mesolithic Age (Middle Stone Age) is characterized by the use of microliths—small, finely chipped stone tools.

These diminutive two-sided blades were more advanced than the larger tools of the Paleolithic Age and were used for hunting and gathering.

The Mesolithic period marked the transition between hunter-gatherers and early agriculture.