Pick out the most effective form of the word from the given options to fill in the blanks to make the sentence meaningfully complete.
The agitators, however, were unhappy with the verbal __________ as they were expecting a written _______________ from an officer.
1
Assure, apology
2
Assuring, apologizing
3
Assurance, apology
4
Assured, apologetic
5
Assurances, apology