Correct Answer: Indispensable

Solution : The correct choice is the third option .

Among the options provided, indispensable is the word that best describes something that is necessary or crucial.

The meanings of the other words are as follows:

• Pedantic : This refers to being overly concerned with minor details or rules, often in a way that can be seen as overly academic or showing off knowledge.
• Trivial : This refers to something that is of little importance or significance, not crucial or necessary.
• Indispensable : This word means absolutely necessary, essential, or crucial.
• Auxiliary : This word refers to something that is providing supplementary or additional help or support, rather than being absolutely necessary on its own.

Therefore, the right answer is indispensable .