Which of the following elements of writing is defined as the choice of words suited to the type of writing

is it style or diction

It's diction because diction is the choice of words and style is the way words are used. An author's style is made up of their diction, tone, details, imagery, and syntax.

you need need more details so we can understand what your asking us.

the correct answer is the name of the author of the quotation appears at the text leading up to it   apex 2018