Only with the discovery of an ozone hole over Antarctica in 1985 did chemical companies finally relinquish their opposition to a ban on chlorofluorocarbons (CFCs), which destroy ozone. The discovery suggested that strong political action to halt production of CFCs might be (i)____________, and fortunately, the chemical industry no longer felt compelled to oppose such action: although companies had recently (ii)____________ their research into CFC substitutes, studies they had initiated years earlier had produced (iii)____________ results. A. imminent B. corroborated C. encouraging D. imprudent E. publicized F. inconclusive G. premature H. curtailed I. unsurprising