Select the most appropriate option to substitute the highlighted segment in the given sentence.
This is an olden building of historical importance.

Correct option is A

The correct substitution of the highlighted words is (a) ancient.
Explanation: The word "olden" is not commonly used in modern English in this context. For describing things of the distant past, especially buildings or artifacts, "ancient" is the most appropriate adjective. "Ancient building" means a structure from a very old historical period.
Grammatical rule used: Use precise and conventional adjectives to describe nouns appropriately. “Ancient” refers to something extremely old and historically significant.
Example: The museum displays an ancient temple sculpture.
Grammar Booster:
Ancient is used for objects or events far back in history.
Older and elder are used for comparisons between people or things. "Elder" is usually restricted to people.