I believe the answer would be a
Well, it would probably have to do with the research on our own opinions, so it would be A).
Answer:
The primary sources of Islamic law are the Holy Book (The Quran), The Sunnah (the traditions or known practices of the Prophet Muhammad ), Ijma' (Consensus), and Qiyas (Analogy).
Explanation:
The answer is a, he miscalculated, since the Americas hadn't been discovered by europeans (the native americans were there first) they did not account for america in their calculations
Mid 1600s is when the system of slavery started