I need some help

A student is revising the sentence below:

Using the spell check function is the most basic revision step a writer can undertake.

Based on the context of this sentence, which would be the best synonym for basic?

Essential—of the utmost importance
Plain—uncomplicated; pure or natural
Primary—first in order of importance, value, or rank
Simple—made up of necessary elements; important

Respuesta :

simple, because it is correct
 .

simple, would be the correct answer  

(context) plain means ordinary, primary means first and essential means is always needed.

(more context) even though you should do spell check it shouldn't be first and isn't always needed and part of spell check is to make it so it's not plain