d. Verb tense error. It should be “decided” instead of “decided”
Answer:
Muslims faith benefited the entire region during their Golden Age by introducing an enormous wave of learning and beautiful cultures to the people of the entire region in other to be knowledgeable about how they should live a good life.
Some of the major accomplishments of the Islamic Caliphates while Europe was still experiencing the Dark Ages are Medicines, Sciences, Philosophy, Arithmetics, Poetry among other things.
"c. A narrative source" is what a historian would use to get a firsthand account of a past event, since in these sources (which are also primary sources) a person is giving a first-hand account of the event itself.
