IMHO - Correct Ans- C
Responding to the dramatic affair, the minister of finance has prepared a speech warning the public that unless their ways are changed, dire consequences would soon befall them.
A. the minister of finance has prepared a speech warning the public that unless their ways are changed, dire consequences
would soon befall. ->Incorrect. with Unless conditional is mentioned in the sentence and "are" in unless clause, simple future (for the uncertain event) or simple present (for the certain event) should follow.
B. a speech has been prepared by the minister of finance warning the public that unless their ways are changed, dire consequences will soon befall ->
Incorrect. "Responding ......" modifier modifies speech making it incorrectC. the minister of finance has prepared a speech warning the public that unless their ways
are changed, dire consequences
will soon befall -> Correct
D. the minister of finance has prepared a speech warning the public that unless their ways are changed, dire consequences
had soon befallen ->Incorrect. Explained in First option
E. the minister of finance has prepared a speech warning the public that unless their ways are changed, dire consequences soon
fell upon -> Incorrect. Explained in First option