What is horizontal log construction?
a. a method of construction used in scandinavia during the middle ages
b. a method of construction used in ottonian architecture
c. both of these
d. neither of these

Horizontal log construction is a method of construction used in Scandinavia during the middle ages  .

This type of construction is characterized with naturally round horizontal logs which are scribed along lateral joints so that the top log fits tightly to the log below.

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.