Hello. I teach English and would like to ask you what you think about the question below. When the United States entered World War I in 1917, its railroad system had just undergone three decades of expansion after the adoption of a standard track width. While the expansion was unquestionably a benefit, it also created the (______) for new logistical problems. Question: Choose one of the words to fill the blank. A. situation B. cause C. possible D. potential The answer is "potential", but I was wondering if "cause" could be an answer, too? Can you tell me why "potential" is the better answer? Thank you in advance.