TEAS Sentence Completion Practice Test 3

This sentence has an error by using an article in an irrelevant place. Usually articles are not used before the adjectives of numbers.
Options “slaying there for a six years”, “staying there for any six years” and “staying there for the six years” use articles a/any/the. That is irrelevant to the context.
Option “staying there for some six years” uses an indefinite pronoun (some). Which also irrelevant.
Option “staying there for six years” is correct, without any article (staying there for six years) it gives a complete meaning to the sentence; hence, it is the correct answer.