Answer:
Our first goal is to pacify those who have been objecting (correct) to the termination(correct) of our previous(correct) president.
Step-by-step explanation:
Our first goals is to pacifist those who have been objecting to the termination of our previous president.
In the above sentence, the correct word to be replaced is "pacify". The other words- objecting, termination and previous are all used in their correct tenses and verb forms, while the use of pacifist for the 'verb' requirement is wrong. 'Pacifist' is the noun form while 'pacify' is the verb form. So, after the correction of the error, the right answer will become
Our first goal is to pacify those who have been objecting to the termination of our previous president.