Why are many are roderick nashs claims about the future lacking solid support?

Nash received his Bachelor of Arts from Harvard University in 1960 and his Ph.D. from the University of Wisconsin–Madison in 1965.[1] He is the author of several books and many essays. His dissertation, "Wilderness and the American Mind," done under the supervision of Merle Curti, became what has come to be seen as one of the foundational texts of the field of environmental history. After teaching for two years at Dartmouth College, he was called to the growing History Department at the University of California, Santa Barbara where he joined distinguished historians such as Wilbur Jacobs, Robert O. Collins, Frank J. Frost, C. Warren Hollister, Leonard Marsak, and Joachim Remak. After witnessing a massive oil spill in Santa Barbara in 1969 he and a number of other faculty members became active within the University and founded an environmental studies program there in 1970. Since the initial 12 graduates in 1972, there have been 4,000 graduates within 300 separate majors. Nash is a firm believer in environmental education and is also an avid white-water river rafter.

C. c is the correct answer.