Which statement about the qur'an is true?

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!

food and resources were plentiful.

women were encouraged to marry later in life so they could work in factories.