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 D. corroborated G. encouraging
B. imprudent E. publicized H. inconclusive
C. premature F. curtailed I. unsurprising