Which suffix can be used to form the antonym of the word Important?

Which of the following prefixes can be added to the given words to form meaningful words?

History, Fix, Sent

In the following questions, a word has been written in four different ways out of which only one is correctly spelt. Select the correctly spelt word.

In the following questions, a word has been written in four different ways out of which only one is correctly spelt.

Select the correctly spelt word.