1. Arabic numerals or more precisely Hindu-Arabic numerals, is a positional decimal number system, and is the most common system for symbolic presentation of numbers. It was invented by Indian mathematicians, later adopted by the Arab, whose traders presented it to Europeans and thus got the name Arabic numerals. This system has a decimal marker, uses zero and nine numeric symbols and is suitable for easy computing, and this convenience has contributed to be adopted by traders, for easier trade.
The answer is: C.
2. The Arabs have been known for many high-quality and valued products, which also include spices, but among the most valuable trade goods were cotton textiles.
The answer is: A.
3. Muslim architecture and entire heritage include the remains and influences of older civilizations such as Roman and Byzantine. Namely, after the emergence and expansion of Islam, by forming caliphates, Muslim scientists and scholars carefully collected and preserved all knowledge in the field of science, art, architecture and other fields, creating invaluable libraries of previous knowledge. Thus in those countries where the Romans and Byzantines once ruled, all those influences and knowledge were collected and incorporated into Islamic architecture and culture in general.
The answer is: C.
