I believe that the answer is D.
The best and most correct answer among the choices provided by your question is the fourth choice.
Craft guilds were formed in the Middle Ages <span>to provide structure and support for artisans who shared a trade.</span>
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The correct answer is C. It is during this time that Islamic scholars made advancements in technology, literature, philosophy, mathematics, asstronomy and the arts. It is this time where the Islamic world was ruled by caliphates. All Islamic scholars were ordered to gather and translate all of the world's knowledge.
Teotihuacan is an ancient Mesoamerican city located 30 miles (50 km) northeast of modern-day Mexico City. ... By the time the Aztecs found the city in the 1400s and named it Teotihuacan (meaning “the place where the gods were created”), the city had been abandoned for centuries.
Answer: Herding animals.
In the zones of the semi-arid climate, there are huge areas of savannahs and steppes. Annual rainfall varies from 250 to 760 mm. This moisture is enough for grassy vegetation, but not enough for full forests. Severe droughts in these areas are a fairly common phenomenon. In open level spaces with rare trees prevail strong winds. The necessary conditions of existence of grassy vegetation of this zone are grazing of large herd animals which liberate vegetative communities from the accumulated straw and destroy bushes. The bulk of the plant grass mass is concentrated underground. The powerful root system allows it to accumulate nutrients and moisture. Herding animals stimulate the regeneration of vegetation.
