Which type of erosion can place a boulder in the middle of a field?

Plucking.

Explanation:

Plucking is a glacial phenomenon that cuases erosion and it moves individual pieces of bedrock. When a glacier moves down a valley, the friction melts the basal ice, which then infiltrates cracks in the bedrock. As the glacier flows, mechanical weathering releases rock on the valley walls, which drops as debris on the glacier. Glaciers can carry both giant boulders and silt.

the correct answer is the following is a list of inventions made in the medieval islamic world, especially during the "islamic golden age" (8th to 13th centuries),[1][2] as well as the late medieval period, especially in the emirate of granada and the ottoman empire.

science and technology in the islamic world adopted and preserved knowledge and technologies from contemporary and earlier civilizations, including persia, india, china, and greece-roman antiquity, while making a number of improvements and innovations.

the answer your looking for is c. : )