The answer is C.
I got this answer by the process of elimination. Not A - Because it is a holy book consisting of the words of God (or Allah) that were revealed to Muhammad in a cave. Not B- The Quran is known for being written in only one language--that's Arabic (translations may be done in different languages, but a Quran itself will always be in the Arabic language.) Not D - Muslims constantly follow the Quran because it is their holy book, much like a Christian with the Bible or a Jew with the Torah.
Hope this helped!
What do you mean opportunity cost is the next best thing you lose out on like for example if you got a chose to buy cheap car oil verse expensive oil if you chose the expansive one you lose on a cheaper price if you would of chose the cheap one but if you chose the cheap one you lose out on a better quality <span />
Both alike: both follow Islam
Different: they have different perspectives of Mohamed <span />