Roland has developed and patented an inexpensive and organic way to enhance the fertility of clay soils without the addition of chemical fertilizers. established agricultural chemical companies have rejected his proposals. after six months of promoting his invention during his time off from his regular job, roland has decided to set his dream aside. roland lacks a key characteristic of successful entrepreneurs, which is:

a. the ability to identify opportunities
b. a corporate sponsor
c. financial slack
d. passion for his invention