Parts of the following sentence are given as options. Identify the part that contains a grammatical error.
Such was the education of the Spartans with regard to one of the greatest of there kings.

Option (a) contains an error.
Explanation: The word "there" is incorrectly used. The correct word is "their", which is a possessive pronoun.
Correct sentence: Such was the education of the Spartans with regard to one of the greatest of their kings.
Grammatical rule used:
· "There" refers to a place.
· "Their" is used to indicate possession.
Example: Their house is near the river. (not there house)