What title was given to the supreme islamic authority, the successor of the prophet?
a. sharia
b. sunni
c. caliph
d. shia

c. Caliph
Caliph is the title given to a Muslim authority who is known to be the successor of the prophet. It was told that when Prophet Muhammad died, it was Abu Bakr who followed his steps taking over the political and administrative duties and responsibilities. The term was also used in Q’ran to refer to Adam and David as vice-regents of God.  Abu Bakr together with his successors are considered to be the perfect caliphs or successors in their times.

The answer is crop yield.