Choose the word that can substitute the given group of words.

Something that is necessary or crucial

Indispensable

The meaning of the option words are-

1.  Pedantic : is an adjective that describes a person, behavior, or style that is overly concerned with minor details, rules, or academic knowledge, often to the point of being annoying or ostentatious. Someone who is pedantic may be excessively focused on adhering strictly to the technicalities or formalities of language, grammar, or other subjects.

2. Trivial :  is an adjective that describes something as being of little significance, importance, or value. It refers to things that are considered unimportant, ordinary, or not worthy of serious attention or consideration.

3. Indispensable :  is an adjective used to describe something or someone that is absolutely necessary, essential, or critical for a particular purpose or situation. When something is considered indispensable, it means that it cannot be done without, and its absence would significantly impact the functionality, success, or completeness of a system, process, or endeavor.

 4. Auxiliary : As an adjective, "auxiliary" refers to something that provides additional support, help, or assistance to the main or primary thing. It is used to describe something that is secondary or supplementary in nature.

- Thus, the best word that can substitute the given group of words is indispensable.