Correct option is C
Option (c) contains an error.
Explanation:
The word Their is a possessive pronoun used to show ownership (e.g., their house, their books).
The correct word in this context should be There, which is used to indicate the existence of something.
Correct phrase:
There are numerous buildings...
Grammatical rule used:
· There is used as an introductory subject in existential constructions (There is/There are).
· Their is a possessive pronoun used to indicate possession.
Example:
There are many shops on this street.
(NOT Their are)