Which statement from the article would be MOST important to include in a summary of the article? (A) In mathematics, Muslim scholars introduced the use of zero, and even the Arabic word "algebra."
(B) Much of the knowledge developed by Muslims allowed Europeans to move past the Dark Ages.
(C) There was a great deal of money to be made from building this infrastructure.
(D) Cellular phones, for example, are increasingly popular in the Middle East.