The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. According to the standard deviation rule, almost all (99.7%) of the students spent on textbooks in a semester:

		A. between 215 and 255 dollars.
		B. between 195 and 275 dollars.
		C. between 175 and 295 dollars.
		D. less than 215 dollars or more than 255 dollars.
		E. above 235 dollars.